CJ's Home Decor & Fireplaces, LLC
Where Fire Meets Decor

1-888-986-1535
814-723-9394
 21701 Route 6
Warren PA, 16365

A visit to our showroom is well worth your time!
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Vent Free Log Sizing Vent Free Log Sizing
Determining vent-free gas log set size is similar to the process for vented logs, but requires consideration of additional factors, such as room volume, minimum clearance to combustible materials outside the fireplace and proper clearances between the log set and the inside walls of the fireplace, which are critical for vent-free operations. By taking a few measurements of the inside of the fireplace and of the room in which you intend to place your vent-free gas log set. Please record your firebox measurements to take with you when you visit us. As with our vented log sets, Vent-free log set sizes are based on the approximate length of the front log of the set, and for sets with two piece front logs, the combined length of the two log pieces, when installed, will correspond to the size of the set, so a 24" set will have a front log that is approximately 24". Please note that the length of the front log(s) vary, and a 24" set may actually have a front log whose length is 23" to 25".

Room volume should be measured first, to determine the maximum BTU per hour that the room can support, per the National Fuel Gas Code's definition of unconfined space. The National Fuel Gas Code defines an confined space as a space whose volume is less than 50 cubic feet per 1,000 BTU per hour of the aggregate input rating of all appliances installed in that space, and defines an unconfined space as a space whose volume is not less than 50 cubic feet per 1,000 BTU per hour of the aggregate input rating of all appliances installed in that space. Rooms communicating directly with the space in which the appliances are installed, through openings not furnished with doors, are considered a part of the unconfined space. Vent-free gas logs should not be installed in a confined space, as defined above, or in homes of unusually airtight construction, unless provisions are made to supply adequate combustion and ventilation air to the space. Calculate the maximum BTU per hour the room can support by following the steps below.

Step One: Determine the volume of space in cubic feet — Length of Room X Width of Room X Height of Room = Cubic Feet of Space. (Include adjoining rooms with doorless passageways)

Example: 24' (L) X 16' (W) X 8' (H) = 3,072 cu. ft.

Step Two: Multiply the volume of the space by 20 BTU/hour, to determine the maximum BTU the space can support.

Example: 3,072 cu. ft. X 20 BTU/Hr. = 61,440 BTU/Hr.

Step Three: Add the BTU/hour of all fuel burning appliances in the space.

Vent-Free Heater BTU/Hr. (Gas Log Set)
Gas Appliance #1 BTU/Hr. (Wall Heater)
Gas Appliance #2 BTU/Hr.
Total BTU/Hr.

Example: gas log set 26,000 Btu/Hr. + wall heater 25,000 Btu/Hr. = 51,000 Btu/Hr.

In the example above the room is an unconfined space, because the 61,440 Btu/Hr. the space could support is higher than the 51,000 Btu/Hr. total of the appliances in the room, and the gas log set could be used in the room. If the total Btu/Hr. was higher than 61,440, the room would be a confined space, and additional fresh air must be provided before using these appliances in the room.

Fireplace measurements should be made from the inside surfaces or firebrick of the fireplace. These measurements should be taken from the fireplace floor, inside the hearth or lip of the fireplace. In deeper fireplaces, front width measurements can be taken 6" to 8" from the front of the fireplace if desired, as long as minimum clearances can still be maintained.

Once fireplace measurements have been taken, they should be compared with the minimum fireplace dimensions for Vent-free gas logs sets listed below, to ensure proper clearances can be achieved.


All minimum clearances must be met for safe and proper operation of your vent-free log set.

Another consideration when sizing your vent-free gas log set is clearance to combustible materials.

While a vented fireplace releases most of its heat through the chimney flue, almost all of the heat produced by a vent-free log set radiates out of the fireplace and into the room in which it is installed, which could present a fire hazard if combustible materials are placed too close to the source of this heat.

Minimum clearances to combustible materials must be determined to maintain proper side clearances to the mantle, ceilings and walls surrounding the fireplace, which are detailed in your user manual of your fireplace.

Note that heat resistant material, such as gypsum board, sheet rock, slate, tile, marble, etc. should be used to cover the first 8 inches above the fireplace in applications where no canopy is used. Also note that longer projections from the wall require greater clearances from the top of the fireplace.
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Fireplaces using a hood require less clearance above the fireplace opening than those without a canopy, and do not require heat resistant materials be installed immediately above the fireplace top opening.

CJ's Home Decor & Fireplaces, LLC recommends the use of a fireplace hood with your vent-free fireplace and gas log set.
If there are any questions please email our tech department. 


Minimum Clearances Minimum Clearances
Another consideration when sizing your vent-free gas log set is clearance to combustible materials.

While a vented fireplace releases most of its heat through the chimney flue, almost all of the heat produced by a vent-free log set radiates out of the fireplace and into the room in which it is installed, which could present a fire hazard if combustible materials are placed too close to the source of this heat.

Minimum clearances to combustible materials must be determined to maintain proper side clearances to the mantle, ceilings and walls surrounding the fireplace, which are detailed in Figure 2. Click Here For Larger View Of Diagram


Flat Mantel Minimum Clearances NO Hood Flat Mantel Minimum Clearances NO Hood
All minimum clearances must be met for safe and proper operation of your vent-free log set.

Flat mantle minimum clearances above the fireplace, for fireplaces without a canopy installed, are illustrated in Figure 3. Note that heat resistant material, such as gypsum board, sheet rock, slate, tile, marble, etc. should be used to cover the first 8 inches above the fireplace in applications where no canopy is used. Also note that longer projections from the wall require greater clearances from the top of the fireplace, as shown in Figure 3. 


Flat Mantel Minimum Clearances With Hood Flat Mantel Minimum Clearances With Hood
Fireplaces using a Hood require less clearance above the fireplace opening than those without a canopy, as shown in Figure 4, and do not require heat resistant materials be installed immediately above the fireplace top opening.

CJ's Home Decor & Fireplaces, LLC recommends the use of a fireplace hood with your vent-free fireplace and gas log set.  






 





 
FEATURED PRODUCTS
America's first choice for Old World, Vintage and Retro bath products.
 
Complete Outdoor Kitchen with Grill and Granite
 
Components To Build Your Own Island
 
Victorian, coal burning or fireplace which was not designed for burning wood, but has a flue.
 
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Hoods attach with or without an enclosure
 
Natural Stone? Take a closer look. Our complete line of Cast Stone
 
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Drapery Walls, Security Screens, Safety Curtains, etc!
Fax or email us your specs.
 

Why buy from us?
Over 18 years experience in the hearth industry, made CJ's Home Decor & Fireplaces, LLC a name you can trust and rely on. Our friendly knowledgeable sales staff offer courteous service and quality products to every customer.

Certified installation and repair service is available in the greater Warren county area. We install and service what we sell.

Select From A Wide Variety Of Fireplace Products For Your Hearth, Home And Backyard.
Shop online or visit our 3000 square foot showroom with over 100 displays for your viewing pleasure, located on 2815 Pennsylvania Ave. West (Route 6), in downtown Starbrick, PA, 16365.

We constantly update our product lines to offer the very best quality and brands.
 
CJ's Home Decor & Fireplaces, LLC
21701 Route 6 - Warren PA, 16365
Phone: 814-723-9394 - Fax: 814-723-4187 - info@cjshomedecor.com