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Frequently Asked Questions
Where does an inline housing belong?
Where there is no plant room to use.
Extract systems and small ventilation branches.
Retrofit filtration into existing ductwork.
Anywhere air must be cleaned along its route.
It saves building a filter section.
That is usually the whole justification.
Why is the access panel the main design question?
Because it decides whether filters get changed.
The housing sits in the duct, often at high level.
Someone has to open, reach, withdraw and reseal.
In the actual position, not on a bench.
An unreachable panel means no maintenance.
Check the installed position, not the drawing.
What makes sealing harder here?
Duct pressure differentials find every leak.
Panel gaskets degrade with repeated opening.
Fastenings loosen over many cycles.
Replaceable gaskets are worth specifying.
So are fastenings built for repeated use.
Both beat a marginally better filter.
Does orientation matter?
Yes, and not every housing suits both.
Horizontal and vertical impose different loads.
Condensation drains differently in each.
Filter retention differs as well.
Confirm the rating for the intended orientation.
Decide it before the duct is fabricated.
How is the change interval decided?
By pressure drop across the filter.
Test points must be on the housing.
There is nowhere else to put them in a duct.
Without them the interval is guesswork.
Record a clean baseline at commissioning.
A permanent gauge is better than a portable one.
What filter types can it take?
Whatever the housing depth accommodates.
Panel depth is the common case.
Deeper units accept pleated or bag filters.
Deeper media means longer intervals.
Duct space usually limits the choice.
Match the housing to the interval wanted.
What is commonly overlooked?
Support and weight in the duct run.
A loaded housing is heavier than the duct around it.
Independent support is often required.
Access clearance to the panel as well.
Other services get installed into it later.
Mark the access zone at first fix.