Wall Cap and Roof Jack
| What it is | The termination fitting where the hood duct passes out through an outside wall or the roof deck. |
|---|---|
| Where it sits | Where the duct leaves the building, wall or roof |
| How it fails | Flap seized with grease, screen blocked, or the cap undersized |
| Checked with | Looked at from outside, and felt for flow with the blower on |
| Price | Quoted after the $89 visit |
The last part of the system, and the least looked at
Everything else in a hood is indoors, where somebody eventually notices it. This fitting is outside, above head height, and years go by without a glance. It still has to open on every start.
Seized flaps and blocked screens
Grease that slips past the filters cools and settles here first. The flap stiffens, stops lifting on low, then stops altogether. A mesh screen behind it loads the same way, and so does a nest or a coat of paint from the last time the trim was done. A canopy roaring against a shut flap sounds powerful and moves nothing.
What can be seen from the ground
Have somebody run the blower on high while you stand outside and watch. A flap that lifts and holds is working; one that shivers and stays down is the reason your kitchen fills. Stop there — climbing is our part, not yours. Wolf Repair Los Angeles checks the outside end on the $89 visit, (310) 626-4008.
What putting it right costs
This one has no published band. Wolf Repair Los Angeles puts a figure on it after the diagnosis, as one number covering the part and the labour, and nothing is ordered until you have agreed it — (310) 626-4008.
A flat $89 buys the call-out and a full diagnosis, and that $89 is deducted from the repair once you have approved it.
Follow-ups
Can a blocked cap on its own stop a hood working?
Yes. The blower still spins and still makes its noise, but air that cannot leave the duct simply backs up, so smoke drifts along the ceiling instead. That is why the outside end gets checked before anyone talks about a new motor. Wolf Repair Los Angeles starts at the cheap end.
Should the cap be cleaned at the same time as the filters?
Not on the same schedule. Filters come out often and go straight back after a wash; the termination is a once-in-a-while job that belongs with a service visit, because reaching it safely needs a ladder and, on a roof, considerably more than that. Ask for it while somebody is already on site.