Advantages & Disadvantages of Keyless Door Locks

May 26, 2018
Advantages & Disadvantages of Keyless Door Locks
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Keyless door locks have become popular among homeowners in recent years. Although these locks were originally developed for use in cars with remote entry systems, they have been successfully modified for use in homes as well.

There are a number of reasons to consider including a keyless door lock in your home. However, there are also some risks associated with this type of system, so it’s important to consider all pros and cons before you install one in your home.

Advantages of Keyless Door Locks

One of the main advantages of a keyless door lock is not needing to carry a key. You’ll no longer need to worry about losing your key or fidgeting at the door to get it open.

It also means that you won’t need to store a spare key somewhere on your property, as many homeowners currently do. Because most criminals are used to looking around to find a spare key, eliminating the need for one will help make your home safer.

Another advantage of keyless door locks is that you can provide entry to your home for others at your discretion. You will not need to make copies of a key or leave keys for dog walkers, housekeepers, or house guests to get in to your home. Rather, you’ll simply need to tell those people the proper code in order to gain access.

With the system in place, you can also tell exactly when and how people attempted to access your home. This gives you a good idea of how secure your house is.

Disadvantages of Keyless Door Locks

While there are many benefits to including a keyless door lock system in your home, there are also some major drawbacks to consider as well. While keyless door lock systems are generally safe and designed to alert police or other authorities if incorrect codes are entered too many times, it is nonetheless possible that an intruder may be able to gain access to your home through this system by guessing or hacking the code.

Just as you can forget your keys and be locked out of your home, you can also forget the passcode to access your keyless entry system and be locked out. While it is safer to use a completely random code and avoid obvious choices like birth dates or simple, repetitive numbers, this can pose a problem if you have a difficult time remembering things.

One final disadvantage of keyless door locks is that electrically-powered systems may not function properly in the case of a power failure. This can leave your door completely locked throughout the failure, or it may result in the door not locking properly and remaining open. Fortunately, most systems have battery backup systems as a fail-safe.

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Key Card Door Lock

May 12, 2018
Key Card Door Lock
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keycard lock is a 
lock operated by a keycard, a flat, rectangular plastic card with identical dimensions to that of a credit card or American and EU driver's license. The card stores a physical or digital pattern that the door mechanism accepts before disengaging the lock.

There are several common types of keycards in use, including the mechanical holecard, barcodemagnetic stripeWiegand wire embedded cards, smart card(embedded with a read/write electronic microchip), and RFID proximity cards.

Keycards are frequently used in hotels as an alternative to mechanical keys.

The first commercial use of key cards was to raise and lower the gate at automated parking lots where users paid a monthly fee.


Keycard systems operate by physically moving detainers in the locking mechanism with the insertion of the card, by shining LEDs through a pattern of holes in the card and detecting the result, by swiping or inserting a magnetic stripe card, or in the case of RFID cards, merely being brought into close proximity to a sensor. Keycards may also serve as ID cards.

Many electronic access control locks use a Wiegand interface to connect the card swipe mechanism to the rest of the electronic entry system.

Newer keycard systems use radio-frequency identification (RFID) technology such as the TLJ infinity.

Type of Card Reader

Mechanical keycard locks employ detainers which must be arranged in pre-selected positions by the 
key before the bolt will move. This was a mechanical type of lock operated by a plastic key card with a pattern of holes. There were 32 positions for possible hole locations, giving approximately 4.3 billion different keys. The key could easily be changed for each new guest by inserting a new key template in the lock that matched the new key.

In the early 1980s, the key card lock was electrified with LEDs that detected the holes.

Wiegand Cards
Since the keycode is permanently set into the card at manufacture by the positions of magnetic wires, 
Wiegand cards can't be erased by magnetic fields or reprogrammed as magnetic stripe cards can. Many electronic access control locks use a Wiegand interface to connect the card swipe mechanism to the rest of the electronic entry system.

Magnetic Stripe
Magnetic stripe (sometimes "strip") based keycard locks function by running the magnetic stripe over a sensor that reads the contents of the stripe. The stripe's contents are compared to those either stored locally in the lock or those of a central system. Some centralized systems operate using hardwired connections to central controllers while others use various frequencies of radio waves to communicate with the central controllers. Some have the feature of a mechanical (traditional key) bypass in case of loss of power.

Passive RFID
RFID cards contain a small chip and induction loop which the transmitter on the keycard reader can access. The main advantages with RFID cards is that they do not need to be removed from the wallet or pass holder - as the keycard reader can usually read them from a few inches away.

Access Control
In the case of the hotel room lock, there is no central system, the keycard and the lock function in the same tradition as a standard key and lock. However if the card readers communicate with a 
central system, it's the system that unlocks the door, not the card reader alone. This allows for more control over the locks, your card may only work on certain days of the week or time of day. Which locks can be opened by a card can be changed at any time. Logs are often kept of which cards unlocked doors at what times.

Computerized authentication systems, such as key cards, raise 
privacy concerns, since they enable computer surveillance of each entry. RFID cards and key fobs are becoming increasingly popular due to their ease of use. Many modern households have installed digital locks that make use of key cards, in combination with biometricfingerprint and keypad PIN options. Offices have also slowly installed digital locks that integrate with key cards and biometric technology.

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What is Smart Lock

Feb 24, 2018
smart lock is an electromechanical lock which is designed to perform locking and unlocking operations on a door when it receives such instructions from an authorized device using a wireless protocol and a cryptographic key to execute the authorization process. It also monitors access and sends alerts for the different events it monitors and some other critical events related to the status of the device. Smart locks can be considered part of a smart home.

Smart locks, like the traditional locks, need two main parts to work: the lock and the key. In the case of these electronic locks, the key is not a physical key but a smartphone or a special key fob configured explicitly for this purpose which wirelessly performs the authentication needed to automatically unlock the door.

Smart locks allow users to grant access to a third party by the means of a virtual key. This key can be sent to the recipient smartphone over standard messaging protocols such as e-mail or SMS. Once this key is received the recipient will be able to unlock the smart lock during the time specified previously by the sender.

Smart locks are able to grant or deny access remotely via a mobile app. Certain smart locks include a built-in WiFi connection that allows for monitoring features such as access notifications or cameras to show the person requesting access. Some smart locks work with a smart doorbell to allow the user to see who and when someone is at a door.

Smart locks may use Bluetooth SMART and SSL to communicate, encrypting communications using 128/256-bit AES.

What Absorption Type Minibar is Suitable for Hotel Rooms

Jan 18, 2018
What Absorption Type Minibar is Suitable for Hotel Rooms

Room refrigerator is also named room small refrigerator, semiconductors room refrigerators, absorption room refrigerator, mini refrigerator, hotel fridge, mini refrigerator. Hotel room refrigerator is a small refrigerator dedicated in star hotel room for refrigerating fruits, beverages, drinks and other foods, and can also be used for refrigerating cosmetics. There are two main hotel room refrigerator cooling method: semiconductor electronic refrigeration and absorption refrigeration.+

Hotel rooms generally abandon the compressor type small refrigerator and semiconductor type small refrigerator, and choose the mainstream absorption type small refrigerator. The reason is:+

Absorption refrigerator is composed of diffusion absorption refrigeration movement, cabinet and related accessories, the core part is the refrigeration movement, and the movement is a closed system made by a number of steel by bending, combination welding. A certain percentage of ammonia, helium, and water are poured into the system. The refrigerant is ammonia, water is the absorbent, and helium is the diffusion agent. The movement directly uses the heat as the source to drive the refrigerant circulating, to achieve cooling purposes; the system uses the principle of thermal siphon to make the cooling system continuously work without any mechanical transmission.+

Absorption refrigerator is an environmentally friendly high-tech product, because it not using Freon, protecting the ozone layer, without compressor and any mechanical transmission parts, not produce any noise when running, so absorption minibar is reputed as double green environmentally friendly product by the international environmental organizations. Absorption refrigerators are used by plenty of hotels because of advanced technology and high technology content.+


Absorption refrigerator is a thermal power cooling system (electricity, gas, kerosene, various waste heat, etc.). It uses three operating fluid as the component: Ammonia - water - hydrogen. It can be operated in the absence of any electronic or mechanical energy, completely quiet, environmentally friendly, the system is lifetime maintenance-free, and the service life is 15 years, especially suitable for hotels, villas.+

Absorption refrigerator doesn't have compressor, so there is no inrush current when the motor starts, which will have no impact on the local power grid. While the ordinary compressor refrigerator starts about 30 to 40 times every day, starting current reaches 5 amps each time, which is 40 to 50 times of normal operation. What's worse, the instantaneous current of the common compressor refrigerator when starting will greatly affect other appliances running on the same line. Absorption refrigerator uses heat to drive the refrigerant circulating within a closed system, which has no mechanical operation and wear parts, refrigerant leak probability is very low. Therefore, absorption refrigerators are easy maintenance, and have long service life, which is not comparable by a compressor refrigerator.

Modification of Fire Door

Jan 16, 2018
NFPA 80 includes guidelines concerning field modifications of listed hardware, including frames, builder’s hardware, doors, thresholds etc. The growing field of access control and electronic entry systems has resulted in some fire doors being field modified without proper listing agency approval. Field modifications of fire listed assemblies must either be inspected by a listing agency representative, or the modification must be performed by personnel certified to perform such work.

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Annual Inspection of Fire Door

Jan 16, 2018
In the United States, the NFPA requires annual inspections of fire-resistance rated door and frame assemblies.[8] Local Authorities Having Jurisdiction must adopt the new edition for this requirement to take effect. Most jurisdictions in the US will be adopting the IBC (International Building Code) model code, which references the NFPA 80 2007 edition requirement, as their local codes.

NFPA 80 5.2.4.requires the following items shall be verified, at minimum:

  1. No open holes or breaks exist in surfaces of either the door or frame.
  2. Glazing, vision light frames & glazing beads are intact and securely fastened in place, if so equipped.
  3. The door, frame, hinges, hardware, and noncombustible threshold are secured, aligned, and in working order with no visible signs of damage.
  4. No parts are missing or broken.
  5. Door clearances at the door edge of the door frame (Wood Door), on the pull side of the door, do not exceed clearances listed in 4.8.4 (the clearance under the bottom of the door shall be a maximum of 3/4") and 6.3.1 (top & edges 1/8") Metal door (top & edges up to 3/16")
  6. The self-closing device is operational; that is, the active door completely closes when operated from the full open position.
  7. If a coordinator is installed, the inactive leaf closes before the active leaf.
  8. Latching hardware operates and secures the door when it is in the closed position.
  9. Auxiliary hardware items that interfere or prohibit operation are not installed on the door or frame.
  10. No field modifications to the door assembly have been performed that void the label.
  11. Gasketing and edge seals, where required, are inspected to verify their presence and integrity.

According to building and fire codes, annual fire door inspections is the responsibility of the building owner. However, as with other mandatory fire inspections, such as the inspection of fire dampers, the fire door inspections are often omitted and many facilities are out of compliance.[citation needed]

The final say on the acceptance of any inspection requires the approval of the AHJ (Authority Having Jurisdiction).

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Installation of Fire Door

Jan 16, 2018
As well as ensuring the door is hung properly and squarely, it is also very important that where a fire door is installed, any gaps left in the opening between the wall and the door frame must be properly filled with fire resisting material. Fire doors are normally installed by a carpenter.

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Normal Operation of Fire Door

Jan 16, 2018
Most fire doors are designed to be kept closed at all times. Some doors are designed to stay open under normal circumstances, and close automatically in the event of a fire. Whichever method is used, the door's movement should never be impaired by a doorstop or other obstacle. The intumescent and smoke-seal bounding of fire doors should be routinely checked, as should the action of the door closer and latch.

Some fire doors are held open by an electromagnet, which may be wired to a fire alarm system. If the power fails or the fire alarm is activated, the coil is de-energized, and the door closer closes the door. Wireless, battery operated fire door retainers can also be used to safely and legally hold fire doors open.

Rated fire doors are tested to withstand an ASTM E119 standard time-temperature curve for a specified period.[7] There are 20, 30, 45, 60, and 90-minute-rated fire doors that are certified by an approved laboratory designated as a Nationally Recognized Testing Laboratory (NRTL, e.g., Underwriters Laboratories). The certification only applies if all parts of the installation are correctly specified and installed. For example, fitting the wrong kind of glazing may severely reduce the door's fire resistance period.

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Fire Door Failure

Jan 16, 2018
Fire doors are sometimes rendered unable to provide its listed fire resistance by ignorance of the intended use and associated restrictions and requirements, or by improper use. For example, fire doors are sometimes blocked open, or carpets are run through them, which would allow the fire to travel past the fire barrier in which the door is placed. The door's certification markings are displayed both on the door leaves and the fire door frames, and should not be removed or painted over during the life of the building.

Sometimes fire doors have apparently very large gaps at the foot of them, an inch or two even, allowing air movement, such as in dormitory facilities. This can lead the occupants of a building to question their status as 'real' fire doors. NFPA 80 allows a maximum door undercut of 3/4 inch however fire doors are tested with smaller clearances in accordance with NFPA 252.[5] Corridors have a fire rating of one hour or less, and the fire doors in them are required by code to have a fire rating of 1/2 or 1/3 hour, the intent of which is mainly to restrict smoke travel.

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Regulations of Fire Door

Jan 16, 2018
All components are required to adhere to product certification requirements that are acceptable to the local Authority Having Jurisdiction (AHJ) by meeting the requirements of the local building code and fire code. The regulatory requirement will change from country to country. For example, in Australia, the National Construction Code dictates that all fire doors must be tested to certain specifications in order to meet resistance approvals and certification.[4]

For example, in the United Kingdom a fire resisting doorset should be subjected to either a British Standard Fire Test BS 476 Part 22 1987, or a BS/EN 1634-1 2000 test. The results are recorded by the test agency and provided in a report which detail such things as constructional details, distortion data and pressure readings. The numerical fire resistance rating that is required to be installed in a particular building is provided in the Building Regulations approved Document B, or British Standards such as the BS 5588 series (e.g., 30 minutes FD30, or FD30(S) if cold smoke resistance is also required).

Similar technical guidance documents and building regulations are in effect in other countries.

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Component of Fire Door

Jan 16, 2018
Fire doors may be made of a combination of materials, such as:

Both the door leaf (the swinging panel of the door) and the door frame are required to meet the guidelines of the testing agency which provides the product listing. The door frame includes the fire or smoke seals, door hardware, and the structure that holds the fire door assembly in place. Together, these components form an assembly, typically called a "doorset" which holds a numerical rating, quantified in hours of resistance to a test fire. All of the components of the fire door assembly must bear a listing agencies label (with the exception of ball-bearing hinges which meet the basic build requirements of ANSI 156.2 and NFPA 80) to ensure the components have been tested to meet the fire rating requirements.

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What is Fire Door ?

Jan 16, 2018
What is Fire Door ?
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fire door is a door with a fire-resistance rating (sometimes referred to as a fire protection ratingfor closures) used as part of a passive fire protection system to reduce the spread of fire and smoke between separate compartments of a structure and to enable safe egress from a buildingor structure or ship. In North American building codes, it, along with fire dampers, is often referred to as a closure, which can be derated compared against the fire separation that contains it, provided that this barrier is not a firewall or an occupancy separation. In Europe national standards for fire doors have been harmonised with the introduction of the new standard EN 16034, which refers to fire doors as fire-resisting door sets. Starting September 2016, a common CE marking procedure will be available abolishing trade barriers within the European Union for these types of products. In the UK, it is Part B of the Building Regulations that sets out the minimum requirements for the fire protection that must be implemented in all dwellings this includes the use of fire doors. All fire doors must be installed with the appropriate fire resistant fittings, such as the frame and door hardware, for it to fully comply with any fire regulations.

ADEL is a pioneer supplier of fire door in Malaysia! Call/WhatsApp us now at 012-415 1999

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