Famco J-Vent Installation Guide (on metal)

Famco J-Vent Installation Guide (on metal)
INSTALLATION INSTRUCTIONS FOR J-VENTS ON METAL
WITH AND WITHOUT EXTENSION
Flexable Caulking
(at outer edge of
flashing and spotted
on screw heads)
Screws
(self tapping or
Metal Roof Deck
Water Block Caulking
The installation of the FAMCO J-Vent is similar to any other roof mounted vent
with flashing. Follow these instructions or the National Roofing Contractors
Assoc. guidelines :
1) Make sure that the area of the roof where the J-Vent is to be mounted is clear
of any obstructions and is clean and dry (roof trusses, electrical wiring, etc.
[NOTE: DO NOT cut any roof trusses, electrical wiring, etc.]).
2) Cut a round hole in the roof 1/2" larger than the diameter of the J-Vent throat.
Lay a 1/2" bead (width to depth ratio should be equal) of water block caulking
around hole and on the underside of the J-Vent flashing about 1/4" from outer
edge.
3) Place J-Vent so that it is centered over the hole you just cut and press into
place to spread caulk. (If this model has an extension be sure that it is placed so
that you have approximately equal clearance on all sides of hole.)
4) Screw flashing down to roof being sure that all screws are pulled down snug
but not stripped. {Screws should be placed so that they go through the caulking
bead on the flashings underside - approximately 1/2" to 3/8" from flashings
edge}.
5) If you are attaching ducting for exhaust/intake purposes please follow local or
state codes in attaching it to this J-Vent. (Some state codes call for solid ducting
while other allow flex, etc.)
FRESH AIR MANUFACTURING CO.
MERIDIAN, ID
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