View Full Version : Exhaust from high efficiency furnace
Mitchell Chiger
01-23-2013, 08:46 PM
Hello guys,
Below the bow window is the exhaust from a high efficiency furnace penetrating the basement wall to the outside via PVC. My question is this: This window is not fixed, it can be opened. Isn't this an improper installation? How far from a window does an exhaust of this kind need to be??? FYI the exhaust is the closer of the two pipes. Thanks.
PS Please ignore the picture of the sheet metal, I uploaded by mistake but could not figure out how to delete.:o
Brandon Whitmore
01-23-2013, 08:49 PM
Pull the manufacturers installation instructions up (you need the model number) and you'll have the answer.......
Darren Miller
01-24-2013, 02:25 AM
Mitchell;
That installation is incorrect. The exhaust needs to be at least 18 inches above the ground.
Raymond Wand
01-24-2013, 04:39 AM
I believe the distance from vent to operable window is minimum 3 feet.
That is an easy fix fwiw.
Lon Henderson
01-24-2013, 07:21 AM
I believe the distance from vent to operable window is minimum 3 feet.
That is an easy fix fwiw.
Four feet below, four feet to the side
Raymond Wand
01-24-2013, 07:36 AM
Also..check manufactures specs and efficiency and btu rating.
Mitchell Chiger
01-24-2013, 08:59 AM
Thank you all very much for your replys.
neal lewis
01-24-2013, 06:19 PM
Looks to me to be at least 18 inches from the ground. And has to be 12 inches from the window.
Mike Lamb
01-24-2013, 07:13 PM
Mitch, direct and indirect vents have different clearance requirements. If that's a concentric vent (it kind of looks like an Alpine model) then it is direct-vent. Here are the NFPA requirements which vary with the size of the furnace:
[ROP 54/Z223.1-2]
12.9.3 The vent terminal of a direct-vent appliance with an input of
10,000 Btu/hr (3 kW) or less shall be located at least 6 in. (150 mm)
from any air opening into a building, and such an appliance with an
input over 10,000 Btu/hr (3 kW) but not over 50,000 Btu/hr (14.7
kW) shall be installed with a 9 in. (230 mm) vent termination clearance,
and an appliance with an input over 50,000 Btu/hr (14.7 kW)
shall be at least a 12 in. (300 mm) vent termination clearance. The
bottom of the vent terminal and the air intake shall be located at
least 12 in. (300 mm) above finished grade. [ROP 54/Z223.1-2]
Darren Miller
01-25-2013, 02:29 AM
Looks to me to be at least 18 inches from the ground. And has to be 12 inches from the window.
No way it's 18 inches. If the shingles are 12 inches exposed, that vent is lucky to be 12 inches off the ground.
How cold is it in Bergen county???
Bob Elliott
01-25-2013, 09:36 PM
The following list is a summary of vent terminal
location requirements:
1. The termination must be 12 inches above
snow level or grade level whichever is
higher. See Figure 18 for alternate method
to achieve 12” above snow level.
2. The minimum distance for a (1-pipe installation)
from any door, (openable) window, or
gravity air inlet is 4 ft. below, 4 ft. horizontally,
or 1 ft. above.
3. The minimum distance for a direct vent (2-
pipe) installation from any door, (openable)
window, or air gravity inlet is 1 ft. below, 1
ft. horizontally, or 1 ft. above.
4. For one-pipe installations the recommended
minimum distance from an inside corner
formed by two exterior walls is 6 feet, but
is not required.
5. The vent termination for a 1-pipe installation
shall be a minimum of 3 ft. above any forced
air inlet within 10 ft.
6. The vent termination shall be located at least
3 ft. horizontally from any electric meter, gas
meter, regulator and any relief equipment
in accordance to ANSI 2223.1/NFPA S4.
These distances apply ONLY to U.S. installations.
In Canada, the Canadian Fuel Gas
Code takes precedence.
7. Avoid areas where condensate drainage
may cause problems by dropping on planters
or patios, etc. Also ensure that exhaust
gases will not impinge on windows or building
surfaces, which may be compromised or
damaged by condensation. Do not install the
vent terminal such that exhaust is directed
into window wells, stairwells, under decks
or into alcoves or similar recessed areas,
and do not terminate above any public
walkways.
8. Select the point of wall penetration where
the minimum 1/4 inch per foot of slope up
can be maintained.
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