FSD-A-U
FSD-A-U
FSD-B-U / FSD-A-U Fire and smoke dampers.
UL Approval
Description
The FSD-B-U and FSD-A-U models are 3V type multi-blade
fire and smoke dampers approved according to UL standards
(UL555 and UL555S).
Fire dampers close automatically to prevent fire and smoke from
spreading to adjacent fire compartments through HVAC
ventilation ductwork.
The dampers are approved to withstand fire conditions for 90
minutes according to UL555 standard. The FSD-B-U model
achieves Class 1 leakage level according to UL555S at a
temperature of 177 °C. The FSD-A-U model achieves Class 3
leakage level according to UL555S at a temperature of 177 °C.
The FSD-B-U model fire damper incorporates
elastomeric airtight seals along the edges of the closing blades.
The casings or frames of the dampers are manufactured with
reinforced corners. Where height H <425 mm, low profile lines
are used at the top and bottom of the frame. The blades are
reinforced with 3 lengthways structural sections called “Vee’s” to
provide them with greater rigidity and resistance.
Silicone sealant is applied to the joint between the frame and its
enclosure to prevent any air or smoke leakage.
An inspection hatch is required in the ductwork adjacent to the
damper to facilitate periodic inspection and maintenance.
The FSD-B-U / FSD-A-U models are installed vertically with the
blades in a horizontal position, regardless of the direction of the
horizontal air flow.
Series FSD-FLD
2
