Roof space – flexible ducting is crushed/folded
Flexible ducting (extracts or ventilation system) in roof space is crushed/folded
Causes
Ducting has been shifted or crushed when work was carried out in the roof space
Listed under: Interior, fixtures and fittings, mechanical ventilation, Roof, roof space
Cause
Poor initial installation
Repair
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if existing ducting is basically sound and damage is minor, straighten out runs to give a clear flow
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where crushed or damaged ducting restricts airflow or allows air to escape into the roofspace, replace it
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check that the design and specification of the ducting is appropriate to the situation
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larger ducting gives better airflow performance. (Long runs of relatively small-diameter flexible ducting connecting extraction fans to the outside also increase the potential of moisture condensing)
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internal surfaces of ducting should be as smooth as possible to minimise air flow resistance
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have the minimum number of bends possible
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where bends are unavoidable, have them as large diameter as possible
-
have no tight bends as these can cause significant air flow resistance
-
ducting that passes through a cold air space should be insulated to reduce the risk of condensation forming in the duct
-
check that all the connections are properly made
Cause
Ducting has been shifted or crushed when work was carried out in the roof space
Repair
-
if existing ducting is basically sound and damage is minor, straighten out runs to give a clear flow
-
where crushed or damaged ducting restricts airflow or allows air to escape into the roofspace, replace it
-
have the minimum number of bends possible
-
where bends are unavoidable, have them as large diameter as possible
-
have no tight bends as these can cause significant air flow resistance
-
ducting that passes through a cold air space should be insulated to reduce the risk of condensation forming in the duct
-
check that all the connections are sound