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HEATING & COOLING > VENTING > CLASS B VENTING > 4" CLASS B
4" Class B Venting Materials and Accessories
Class B Pipe
Price Per Piece
4" Class B 5' Pipe
4" Class B 3' Pipe
4" Class B 2' Pipe
4" Class B 1' Pipe
4" Class B 90 Elbow
4" Class B Vent Fast
4" Class B Chimney Cap
4" Class B Storm Collar
4" Class B Roof Flashing
4" Class B Wall Thimble
4" Class B Tee
4"-3" Galvanized Reducer/Increaser
Reznor Hanging Brackets
Horizontal Vent Kit
4" Horizontal Vent Kit: Everything
You Need to
(1) Galv 90 Degree Elbows - (2) Galv 2' Pieces of Pipe - (1) Class B 3' Pipe - (1) Class B Wall Thimble - (1) Class B Termination Cap - (1) increaser if needed
Horizontal Venting - General Venting Information
The minimum horizontal vent length is 3'.
If possible, do not terminate the horizontal vent through a
wall that is exposed to prevailing wind. Exposure to excessive
winds can affect unit performance.
Vent termination must be free from obstructions and at least 12" above ground level and maximum snow height.
Do not terminate vent directly below roof eaves or above a
walkway, or any other area where condensate dripping may be
troublesome and may cause some staining. Avoid windows where steam may cause fogging or ice buildup.
When horizontally vented, minimum clearance for termination
from any door, window, gravity air inlet, gas or electric meter,
regulators, and relief equipment is 4'. In Canada, termination is 6'.
Vent termination must be a minimum of 4' below or 4 horizontally from any soffit vent of under-eave on a Mr.Heater or 3' on a Reznor.
Vent must be a minimum of 6' from an inside corner formed by 2 exterior walls. If possible, leave a 10' clearance.
Vent termination must be a minimum of 10' from any forced air inlet (includes fresh air inlet to other appliances, such as a dryer)
When termination is routed through an exterior combustible wall the vent must be supported using a listed clearance thimble.
For horizontal venting, the vent pipe shall be supported with hangers no more the 3' apart to prevent movement after installation.
Horizontal Venting - Specific Residential Information
The vent may be single wall material minimum 25 GSG galvanized steel or equivalent grade stainless steel.
The vent pipe diameter for horizontal residential
installations shall be 4" on 45.000BTU/75.000BTU Mr.Heater
and 30.000-125.000BTU Reznor models.
The maximum vent length is 5' plus one 90 degree elbow if needed.
The vent must maintain a 1/4" rise per foot of slope upwards toward the termination.
Always read the installation manual before installing any gas appliance.