Natural Lobby Damper

The LD and LDN series dampers have been designed for smoke evacuation and control within lobbies and are installed into extract shafts in multi-level buildings, to
maintain tenable conditions in the common escape routes in the event of a fire.
LD series dampers are designed to work in fan power extract systems. Air is pulled through the damper and into the extract shaft.
LDN series dampers work in natural draft (stack effect) ventilation which requires a minimum free area of one metre square to comply with current standards and
Approved Document B specification. 
These dampers are for dry wall or masonry/ concrete construction. 
The Lobby Damper series comprises of 2 models
• LD—Mechanical ventilation applications
• LDN—Naturally ventilated applications

Features: 

• LDN Series - Natural Vent and Mechanical Ventilation
• Suitable for environmental and smoke control extract systems
• Fire resistance tested to EN 1366-10
• Classified according to EN 13501-4
• CE marked to EN 12101-8
• Case leakage - Class C EN 1751 
• Blade leakage - Class 2 EN 1751
• Single and multicompartment use tested to EN 12101-8
• Easy Fix'®' fascia grille

The lobby sleeved damper consists of two parts. The damper within a sleeve and a grille room side for ductless applications.
The main sleeved damper with peripheral flange allows it to be fitted flush into the builder’s prepared aperture. The fitted internal actuator is used to drive the damper blades from the normal closed position to the fully open position on receipt of a
signal from a fire/smoke control and detection system. Closed blade surfaces are painted matt black to allow this product to be inconspicuous behind the EASY FIX® grille.
LD units have vertical damper blades whilst the LDN has horizontal damper blades.
The horizontal blade grille has been designed to maximise the airflow with minimal pressure loss. The grille is affixed to the damper with concealed colour matched fixings. 

The dampers are typically closed in normal operation. Where a fire or smoke is detected, the damper on the level of the fire would receive an instruction from the control system to open to vent the smoke and gases into the smoke shaft.
The Dampers on all other levels remain closed, thus preventing the spread of fire from the riser on those levels.

The Smoke Control series LD and LDN damper shall be certified to ISO 9001 and pass the tested requirements stated in EN 1366-10.
CE marked LD & LDN dampers certificated to EN12101-8.
The test requirements shall allow for installation within a dry line wall and masonry walls.
Designed for smoke evacuation and control within lobbies and are installed within extract shaft walls in multi-level buildings, to maintain tenable conditions in escape routes.
The damper and grille shall be a fully tested product tested to EN 1366-10, certified to EN 12101-8, and classified to EN 13501-4 achieving:
E (120 Vew i’o) S 1000 C10,000 AA Multi 
Dampers shall be typically closed in normal operation and move to the open position via a drive open/drive closed (non spring activated) actuator to vent smoke and gases
into the smoke shaft.
The smoke control damper shall have a tested installation method that matches the requirement of the supporting construction into which it is built.

More sizes available please get in touch for a quote