2
4. Flangefit
4.1 Flangefit VC series dampers are designed to match the mating ductwork flange.
4.2
Use the four corner alignment holes to position the damper using appropriate fixings.
4.3 Fix the damper flange frame to the mating ductwork flange using ductwork cleats. Where intermediate fixing bolts
are used, these should be in accordance with DW144.
4.4 Cleats are advised to be fitted as follows:
a) 200 – 300mm max centres for Pressure Class A
b) 150 – 250mm max centres for Pressure Class B and C, also allowing for a fixing within 50mm of the corner.
4.5 Ensure that the connecting ductwork is supported independently of the damper.
5. Spigotfit
5.1 Spigotfit VC series dampers are designed to be included within ductwork runs.
Appropriate sealant should be applied to the damper spigot to ensure a good seal.
The connecting ductwork should slip over the damper spigot and affixed with steel rivets.
6. Instruction for testing Damper
6.1 Once the damper has been installed, check that the blades move freely using the hand quadrant control or
gripping the extended spindle by hand. The blades should more smoothly fully open to fully closed without
using force. Where an actuator has been factory fitted, this will need to be electrically connected to allow
testing.
7. Routine Inspection, Testing and Maintenance
7.1 Refer to Health and safety procedure (section 1)
7.2 In accordance with BS 9999 Annex W.1, inspection should be undertaken annually. Local regulations/conditions
may override this with periodic Inspection being carried out more frequently where corrosive or dirty conditions prevail.
The maintenance log should be reviewed at each inspection and the frequency adjusted as required dependent
upon findings. (BSB recommend a maximum of 1 year between inspections and to start more frequently initially and
reduce frequencies only if conditions are proven to allow).
7.3 Remove access door or grille to reveal damper’s internal elements.
7.4 Visually inspect the Internal damper elements for signs of corrosion, obstruction or accumulated dirt/dust.
7.5 If there are any obstructions or if the damper blades, case sides are dirty, they need to be cleaned.
7.6 Use a soft cloth with a light application of light lubricant. (Connect Duck Oil recommended).
7.7 There should be no more than a thin film of lubricant applied. Remove all excess lubricant. It is particularly important
as excess oil will tend to collect dirt and dust which will have a negative effect on dampers remaining clean.
4.8 Replace access doors and/or grille.
4.9 Record all work that has been undertaken in the maintenance log.
4.10 It is important to record, and review maintenance frequency based on inspections and test history.
