Desa LGCFTN Determining FRESH-AIR Flow for fireplace Location, Confined and Unconfined Space

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Air For Combustion

and Ventilation

Continued

Unusually tight construction is defined as construction where:

a.walls and ceilings exposed to the out- side atmosphere have a continuous water vapor retarder with a rating of one perm (6 x 10-11kg per pa-sec-m2) or less with openings gasketed or sealed and

b.weather stripping has been added on openable windows and doors and

c.caulking or sealants are applied to areas such as joints around window and door frames, between sole plates and floors, between wall-ceiling joints, between wall panels, at penetrations for plumbing, electrical and gas lines and at other openings.

If your home meets all of the three criteria above, you must provide additional fresh air. See Ventilation Air From Outdoors, page 8.

If your home does not meet all of the three criteria above, proceed to Determining Fresh-Air Flow For Fireplace Location.

Confined and Unconfined Space

The National Fuel Gas Code, ANSI Z223.1/NFPA 54 defines a confined space as a space whose vol- ume is less than 50 cubic feet per 1,000 Btu per hour (4.8 m3 per kw) of the aggregate input rating of all appliances installed in that space and an unconfined space as a space whose volume is not less than 50 cubic feet per 1,000 Btu per hour (4.8 m3 per kw) 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.

*Adjoining rooms are communicating only if there are doorless passageways or ventilation grills between them.

DETERMINING FRESH-AIR FLOW FOR fireplace LOCATION

Determining if You Have a Confined or

Unconfined Space

Use this work sheet to determine if you have a confined or unconfined space.

Space: Includes the room in which you will install heater plus any adjoining rooms with doorless passageways or ventilation grills between the rooms.

1.Determine the volume of the space (length x width x height).

Length x Width x Height =__________cu. ft. (volume of space)

Example: Space size 20 ft. (length) x 16 ft. (width) x 8 ft. (ceiling height) = 2560 cu. ft. (volume of space)

If additional ventilation to adjoining room is supplied with grills or openings, add the volume of these rooms to the total volume of the space.

2.Multiply the space volume by 20 to determine the maximum Btu/Hr the space can support.

___________ (volume of space) x 20 = (Maxi- mum Btu/Hr the space can support)

Example: 2560 cu. ft. (volume of space) x 20 = 51,200 (maximum Btu/Hr the space can support)

3.Add the Btu/Hr of all fuel burning appliances in the space.

Vent-free heater

_ ____________ Btu/Hr

Gas water heater*

_ ____________ Btu/Hr

Gas furnace

_ ____________ Btu/Hr

Vented gas heater

_ ____________ Btu/Hr

Gas fireplace logs

_ ____________ Btu/Hr

Other gas appliances* +_ ___________ Btu/Hr

Total

=_ ___________ Btu/Hr

*Do not include direct-vent gas appliances. Di- rect-vent draws combustion air from the outdoors and vents to the outdoors.

Example:

 

30,000

 

Gas water heater

 

 

_ ____________ Btu/Hr

Vent-free heater

 

26,000

 

+_ ___________ Btu/Hr

Total

=_

56,000

Btu/Hr

4.Compare the maximum Btu/Hr the space can support with the actual amount of Btu/Hr used.

__________ Btu/Hr (maximum the space can support)

__________ Btu/Hr (actual amount of Btu/Hr used) Example: 51,200 Btu/Hr (maximum the space

can support)

56,000 Btu/Hr (actual amount of Btu/Hr used)

The space in the above example is a confined space because the actual Btu/Hr used is more than the maxi- mum Btu/Hr the space can support. You must provide additional fresh air. Your options are as follows:

A.Rework worksheet, adding the space of an adjoin- ing room. If the extra space provides an unconfined space, remove door to adjoining room or add ventilation grills between rooms. See Ventilation Air From Inside Building, page 8.

B.Vent room directly to the outdoors. See Ventila- tion Air From Outdoors, page 8.

C.Install a lower Btu/Hr fireplace, if lower Btu/Hr size makes room unconfined.

119508-01Awww.desatech.com

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Contents Lgcftp and Lgcftn Shown with Optional Cabinet Mantel/Hearth Base Accessory14,000 to 26,000 Btu/Hr with Thermostat Safety Information Table of ContentsSafety Information Product Information Local CodesProvide adequate clearances around air openings Assembly Product FeaturesUnpacking Providing Adequate Ventilation AssemblyAssembling and Installing Trim Air For Combustion VentilationConfined and Unconfined Space Determining FRESH-AIR Flow for fireplace LocationDetermining if You Have a Confined or Unconfined Space Ventilation Air From Outdoors InstallationVentilation AIR Ventilation Air From Inside BuildingCheck GAS Type Installation ItemsLocating Fireplace Fireplace pilot and burner must be at least 18 above floor Built-In Fireplace InstallationCheck all gas connections for leaks. See If you have not assembled firebox, follow instructions onChecking Gas Connections, Removing Upper Louver Assembly Mantel Clearances for Built- In InstallationOptional Mantel Installation Installing blower accessory GA3450TACan cause improper and danger Installing Blower AssemblyExtension Cord Connecting to GAS SupplyFor Built-In Installation Reinstall valve cover shieldNatura L Accessories,Checking Gas Connections Connecting Equipment shutoff valve to heater controlInstallation Items Needed Checking GAS ConnectionsCorrect all leaks at once Pressure Testing Fireplace Gas ConnectionsTest Pressures Equal To or Less Than Psig 3.5 kPa Operating Fireplace For Your Safety Read Before LightingLighting Instructions Thermostat Control Operation Manual Lighting ProcedureOperating Fireplace To Turn OFF GAS To ApplianceBurner Flame Pattern Cleaning MaintenanceInspecting Burner Pilot Flame PatternAir Passageways CabinetExterior Observed Problem Possible Cause Remedy TroubleshootingMaintenance TroubleshootingMaintenance, See Cleaning and MainteSee Checking Gas Connec Gas leak. See WarningReplacement Parts SpecificationsService Hints Technical ServiceTHERMOSTATICALLY-CONTROLLED Blower KIT GA3450TA AccessoriesEquipment Shutoff Valve GA5010 Brass Trim KIT GA6095Models Lgcftp and Lgcftn Illustrated Parts BreakdownParts List Parts Centrals 119508-01A VENT-FREE Compact fireplace Warranty InformationKeep this Warranty Limited Warranty

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