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QUESTION:I have a gas furnace and I would like to run a feed into the garage.
First is this too dangerous to do?
I wont be running a return.
I expect that the heated air will easily get past the outside garage door
jam so it should flow easily into the garage. Also I dont want contaminated
air coming back into the house.
The hole I can run from the basement will go through the rim joist about 6"
off the ground.
I am concerned about CO and flammable gasses going back into the system
through the feed line.
For the exiting vent I was thinking of running pvc pipe to a height of about
2 feet and caulking well at the wall penetration.
This is a new system with low emissions gas furnace vented through a pvc
pipe.
ANSWER: However, Item 1 Detail 1 explanation seems to present a damned if you do damned if you
don't situation for the field worker.
Notice that it states:
Sealing the retaining angles IS NOT a requirement for an
approved damper installation. Building officials sometimes require sealing the angles as a
measure to prevent smoke movement across the protected barrier. The potential for
significant
movement of smoke behind the angles to the opposite side of the protected opening is
minimal.
However in those instances where the sealing is mandated by the local authority, only
SPECIFIC
SEALANTS which have been tested by the manufacturer and listed in their installation
instructions may be used. Any deviation from those listed sealants could render the damper
inoperable and could void the UL listing of the damper. It should be noted that each
manufacturer lists specific sealants and those sealants vary by manufacturer. UNDER NO
CONDITIONS MAY THROUGH-PENETRATION FIRESTOP CAULKS OR PUTTYS BE
USED TO SEAL DAMPER RETAINING ANGLES unless SPECIFICALLY APPROVED by
the damper manufacturer. We do not know of any manufacturer who has tested or approved
sealing retaining angles with Firestop products.
So, are they saying that the inspectors are violating UL approval by demanding to seal the
retaining angles? It sure sounds like it because in the paragraph it states
1. ""only SPECIFIC SEALANTS which have been tested by the manufacturer and listed in their
installation
instructions may be used""
then it says:
2. " We do not know of any manufacturer who has tested or approved sealing retaining
angles with Firestop products."
Well, if the inspector says they want it sealed and nothing is approved, what are we to
do? I have been told to seal them with firestop in each case, but now reading this
contradicts this demand from the inspectors.
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