Another Horizontal Vent Question

[dave67fd]

Just need a couple of clarifications on the following:

1) How have you all connected single wall pipe to B double wall pipe? If sheet metal screws, do you drill clearance holes in the outer pipe or just drill through both? or does it really matter?


2) The specification that the vent needs to be 4' minimum from a window, door ect.. can i assume this is 4' horizontally as well as 4' vertically?

Thanks for any input you guys can provide.
Dave

 

[Roddy73]

They make a connector to go from B to C, some companies call it a drafthood connector. I've seen the c-vent crimped and shoved in the B then just screwed, but I'd get the connector.

Usually the clearances are the same in any direction, if you have the number for the gas inspector that will doing your inspection he may be able to ok it before you cut your hole. They usually go by the manufacturers specs and the code book, the library may have a code book.

 

[dave67fd]

Of course i find this "after" i ask the questions.



How to connect a single wall vent system to a double
wall (type B) vent pipe:

1. Slide the single wall pipe inside the inner wall of the
double wall pipe.
2. Drill (3) holes through both walls of the single and
double wall vent pipes. Using 3/4" sheet metal
screws, attach the two pieces of pipe. Do not over
tighten.
3. The gap between the single and double wall pipe
must be sealed but it is not necessary to fill the full
volume of the annular area. To seal, run a large bead
of 400°F silastic around the gap

Minimum Clearances for
Structure Vent Terminal Location
Forced air inlet within 10 feet 3 feet above
Combustion air inlet of another
appliance 6 feet all directions

Door, window, gravity air inlet, 4 feet horizontal and below
or any building opening 1 foot aboveElectric meter, gas meter, gas 4 feet horizontal (U.S.)
regulator, and relief equipment � 6 feet horizontal (Canada)
Gas regulator � 3 feet horizontal (U.S.)
6 feet horizontal (Canada)
Adjoining building or parapet wall 6 feet all directions
Adjacent public walkways 7 feet all directions
Grade (ground level) 3 feet above ‚

 

[Roddy73]

After you shove the pipes together be sure to seal the edge with high temperature silicone, the guy who wrote this **** must have his head up his annular area!