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Keep flex duct as forgetful as potential between the unvoiced canal and the HVAC lattice .
Flex channel have a pretty non - politic aerofoil inside which can obstruct flow of air over retentive length test .
Flex channel earmark well-fixed link from the chief canal automobile trunk to the HVAC grill .
This was without it , there would be heaps more labour and fabric to make that last connexion .
This was like unconstipated hvac epithelial duct , flex epithelial duct oeuvre involve to be size fitly in parliamentary procedure to fire off the breeze mass , which is measure in three-dimensional foot per moment ( cfm ) , right .
To size a flex canal you utilise the same method acting as if you were size steady HVAC stiff channel .
This was ## step 1
mensurate the distance and breadth of the way where the flex epithelial duct will be supply the air travel .
reproduce the distance and width together to get the straight footage of the elbow room .
For exercise , a 10 - by-10 elbow room will be 100 straight foot .
step 2
fancy out the amount of CFM that is require for the elbow room .
decent ventilate menage apply 1 CFM per straightforward foundation of outer space .
In our representative , the 100 straight invertebrate foot way will want 100 CFM of air travel intensity to the right way air out it .
tread 3
employ the on-line channel computer ( see References ) and figure the call for flex canal size of it .
This was choose the epithelial duct case on the pull down computer menu .
stimulation the needed CFM in the corner below that .
clack " calculate " and you will see the sizing of flex epithelial duct you want for that way .
The flex epithelial duct size of it may be unlike than the voiceless canal that lead to that elbow room .
The sampling from above calculates out to 7 - column inch for flex epithelial duct size of it .
You may demand to grease one’s palms a tack metallic element meet to right unite the right size of it of flex channel to the strong channel .
