SWG Power Venter

Clearance to Combustibles
Table 4
Pipe Size Nominal Cross-Sectional Area Sq. Inches
3" 7
4" 13
5" 20
6" 28
7" 38
8" 50
9" 64
10" 79
12" 113
14" 154
If mounting the venting system near combustible materials, refer to Diagram A for allowable installation clearances. Clearances are based on an installation using single wall galvanized steel vent pipe. If manufactured double wall vent pipe is required or used for the installation, clearance should be based on the vent pipe’s rated clearance. Always check local code requirements for code restrictions.

Routing of the vent system and clearances for the vent pipe may be planned once the termination location is determined. Route the vent pipe from the appliance to the venter using as few elbows as possible. The horizontal section of the vent pipe should have a slight upward slope from the appliance to the venter. The vent pipe size (diameter) can be smaller than a typical chimney vented system and still overcome the higher pressure losses because the power venter mechanically creates the required draft or air flow to vent the system.

For estimating the minimum vent pipe diameter for a gas system, divide the BTU/hr. input of the heating equipment by 12,600 BTU/sq. in. For oil systems, multiply GPH by 140,000 BTU/GAL, then divide by 12,600 BTU/sq. in. This will give the minimum cross sectional area required. (See Table 4 for area to diameter conversion.) For multiple equipment venting systems, divide the total BTU/hr. input for all appliances by 9,300 BTU/sq. in. This will give you the minimum vent pipe diameter needed for the common breach of the vent system.

As a rule of thumb, size the vent pipe to the outlet diameter of the heating equipment for a single appliance venting system. For multiple appliance venting systems, use the outlet diameter of the largest unit and add 50%.

Diagram A

Single Pipe System
Allowable Inlet Temperature Clearance (B)
400°F or Less 3" min.
550°F or Less 4" min.
550°F or Less 3" min.*
Double Pipe System
Allowable Inlet Temperature Clearance (A)
400°F or Less .5" min.
550°F or Less 1" min.
550°F or Less .5" min.*
swgdiagram

Extension Kits

Power Venter Model Extension Kit Model
SWG-4HD PEK-4
SWG-4HDS PEK-4
SWG-5 PEK-5
SWG-5S PEK-5
SWG-6 PEK-6
SWG-6S PEK-6
SWG-8 PEK-8
The standard SWG Power Venter is designed for walls up to 8" thick. PEK extension kits allow the SWG to be installed in walls up to 16" thick.* The PEK kit includes the inner/outer pipe extension, air flow damper, and one foot of 1/4" aluminum tubing. It is available for models SWG-4HD through SWG-8.
SWG Ext Kit
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