SWG/CV Power Venter
The safest, most efficient power venter available today.
Gas and oil heating appliances generate heat through the combustion of fuel. The heat is transferred through the heat exchanger and distributed to the conditioned space. The products of combustion, however, must be vented safely out of the structure. In a conventional chimney, venting is achieved by the natural lifting action of the hot combustion gas. New, efficient systems absorb more of the heat in the heat exchanger and produce lower temperature vent gas. Lower temperature gas does not rise as quickly or as reliably as in older, less efficient systems. Power venting or sidewall venting is more economical and safer than chimney venting. A power venter uses a motorized blower to vent the products of combustion. A power venter is interlocked with the appliance to ensure that proper draft is achieved before the appliance burner is activated. Outdoor Mounted Power Venters for Oil & Gas
Patented SWG or ComboVent Power Venters are ETL and cETL listed for all LP gas, natural gas, or oil-fired heating equipment. The SWG or ComboVent combines the motor, blower, and vent hood in one complete, easy to install unit. The SWG mounts on the outside of the building and pulls the combustion gases from the appliance through the outside wall utilizing 100% negative pressure. Benefits of the SWG or ComboVent Power Venter include:
- 100% negative pressure in the vent pipe for maximum safety.
- Standard galvanized pipe can be used instead of expensive stainless steel.
- No need to seal vent pipe joints, saving time and money.
- Significantly longer vent lengths than positive pressure, direct vent systems.
- The SWG or ComboVent is recommended by major heating appliance manufacturers.
The SWG or ComboVent must be sized to match the appliance or appliances’ input firing rate. Most firing rates are published in the manufacturer’s installation manual. The SWG and ComboVent must be installed with a CK Control Kit to ensure proper listing and safe, efficient venting. When to use the SWG/CV Power Venter:
- Use with gas or oil furnaces, boilers, and water heaters.
- New construction.
- When converting from electric to gas or oil.
- To avoid relining a chimney.
- When installing an additional heating appliance.
- When co-venting with water heater or additional appliance, can be used as a gas/oil combo single unit.
How the SWG/CV Works
- The thermostat calls for heat, energizing the Power Venter (A).
- A negative pressure is created, closing the pressure switch on the control kit (B).
- The burner (C) is activated and combustion gases are exhausted (D).
- After the thermostat is satisfied, the burner shuts down and the venter continues to post purge, exhausting residual flue gases.
- When the timer or temperature control is satisfied, the venter is deactivated.
Sizing The Venter
Size the SWG or ComboVent venter based on the input firing rate of the appliance. If the power venter is being used to vent multiple appliances, add the input firing rates for each appliance and use that total to size the venter. Knowing the total input BTU/hr. for gas, or GPH for oil, the venter can be sized from Table 1. Select the venter rated closest to the total input BTU or GPH for installation. If the input of the appliance is higher than the maximum allowable for the size SWG or CV, move to the next larger size SWG or CV. Do not select a venter with a maximum BTU/hr. or GPH lower than the appliance. The equivalent feet of vent pipe for the installation must be calculated. Based on the vent pipe diameter to be used, compare the calculated quivalent feet of vent pipe with the maximum equivalent feet allowable for the venter (See Table 1). If the calculated equivalent feet is greater than that allowed for the venter, increase the diameter of the vent pipe to be used and refer to the table or use the next larger size SWG or CV venter.
Calculating Equivalent Feet of a Vent SystemHow to determine total eqivalent feet
Note: In Table 1, the maximum equivalent footage allowable for the vent pipe is given for two points, the maximum BTU/hr. venting capacity and at 60% of the maximum. This allows for estimating values between the two given points.
Terminal Locations of a Vent System
- Determine the total equivalent feet for each type of fitting used in the venting system from Tables 2 and 3.
- Calculate the total feet for the straight lengths of pipe.
- Add the equivalent feet of the fittings to the total amount of feet of straight length pipe. This will approximate the total equivalent feet of the vent system.
- Find your total equivalent feet in Table 1 to determine the proper model for your installation.
Location of the termination of the venting system should comply with the National Fuel Gas Code, ANSI Z223.1, manufacturer's recommendations, and/or applicable local codes. See diagram for typical terminal locations.
A. The exit termination of a mechanical draft system must not be less than 7' above grade when located adjacent to a public walkway.*
B. The venting systems, with the exception of direct vent appliances, must terminate at least 4' below, 4' horizontally, or 1' above any door, window or gravity air inlet into the building.
C. A venting system must terminate at least 3' above any forced air inlet located within 10'.
D. The bottom of the vent terminal must be located at least 1' above finished grade. **
E. The vent termination should not be mounted directly above or within 3' horizontally from an oil tank vent or gas meter (not shown in diagram).
F. The vent termination point must not be installed closer than 3' from an inside corner of an L-shaped structure.
G. For basement installations where a window well must be used or in installations where the vent terminal cannot be mounted to maintain the minimum 12" clearance above grade, use a Field Vent RiserTM. The Vent Riser ensures the vent termination is above grade or the snow line and is in compliance with local codes (not shown in diagram).