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NOTE: DIAGRAMS & ILLUSTRATION ARE NOT TO SCALE.

4

       

WARNING

If the area in which the heater may be

 

operated does not meet the required 

volume for indoor combustion air, 

combustion and ventilation air shall 

be provided by one of the methods 

described in the National Fuel gas 

Code, ANSI Z223.1/NFPA 54, the Inter-

national Fuel gas Code, or applicable 

local codes.

Today’s homes are built more energy efficient 

than ever. New materials, increased insulation 

and new construction methods help reduce 

heat loss in homes. Homeowners apply weather 

strip and caulk around windows and doors to 

keep the cold air out and the warm air in. During 

heating months, homeowners want their homes 

as airtight as possible.

While it is good to make your home energy 

efficient, your home needs to breathe. Fresh 

air must enter your home. All fuel-burning ap-

pliances need fresh air for proper combustion 

and ventilation.

Exhaust fans, some fireplaces, clothes dryers 

and some fuel-burning appliances draw air 

from the house to operate. You must provide 

adequate fresh air for these appliances. This will 

ensure proper venting of vented fuel-burning 

appliances.

PROVIDING ADEQUATE VENTILATION

The following are excerpts from 

National Fuel 

Gas Code, ANSI Z223.1/NFPA 54, Air for Com-

bustion and Ventilation

.

All spaces in homes fall into one of the three 

following ventilation classifications:

1.  Unusually Tight Construction

2.  Unconfined Space

3.  Confined Space

The information on Pages 8 through 10 will help 

you classify your space and provide adequate 

ventilation.
Unusually Tight Construction

The air that leaks around doors and windows 

may provide enough fresh air for combustion 

and ventilation. However, in buildings of un-

usually tight construction, you must provide 

additional fresh air.
Unusually tight construction is defined as 

construction where:
a.  walls and ceilings exposed to the outside 

atmosphere have a continuous water 

vapor retarder with a rating of one perm 

(6 x 10

-11

 kg per pa-sec-m

2

) or less with 

openings gasketed or sealed and

b.  weather stripping has been added on 

openable windows and doors and

       

WARNING

Heaters installed in these appli-

ances shall not be installed in a 

room or space unless the required 

volume of indoor combustion air is 

provided by the method described 

in the National Fuel Gas Code, ANSI 

Z223.1/NFPA 54, the International 

Fuel Gas Code, or applicable local 

codes. Read the following instruc-

tions to ensure proper fresh air for 

this and other fuel-burning appli-

ances in your home.

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 plumb-

ing, 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, in the In-

stallation and Operation manual for the heater. 
If your home does not meet all of the three 

criteria above, proceed to Determining 

Fresh-Air Flow For Firebox Location.
Confined and Unconfined Space

The National Fuel Gas Code, ANSI Z223.1/ 

NFPA54 

allows two methods for determining 

whether the space in which the heater is being 

installed is confined or unconfined space. The 

standard method defines a confined space as 

a space whose volume is less than 50 cubic 

feet per 1,000 Btu per hour (4.8 m

3

 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 

m

3

 per kw) of the aggregate input rating of all 

appliances installed in that space. Rooms com-

municating directly with the space in which the 

appliances are installed*, through openings 

not furnished with doors, are considered a 

part of the unconfined space.
Where the air infiltration rate of a structure 

is known, the Known Air Infiltration Rate 

Method may be used. Follow The National Fuel 

Gas Code, ANSI Z223.1/NFPA 54 to use this 

method to determine if the space is confined 

or unconfined.
* Adjoining rooms are communicating only if 

there are doorless passageways or ventilation 

grills between them.

DETERMINING FRESH-AIR FLOW FOR 

Heater LOCATION

Determining if You Have a Confined or 

Unconfined Space Using the Standard 

Method

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 22 ft. (length) x 18 

ft. (width) x 8 ft. (ceiling height) = 3,168 

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

:

 3,168 cu. ft. (volume of space) x 

20 = 63,360 (maximum BTU/Hr space can 

support)

3.  Add the BTU/Hr of all fuel burning appli-

ances in the space.

 

Vent-free fireplace     ________ 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 appli-

ances. Direct-vent draws combustion 

air from the outdoors and vents to the 

outdoors.

 

Example

:

 

Gas water heater        40,000    BTU/Hr

 

Vent-free fireplace  +    39,000    BTU/Hr

 Total 

   79,000    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

:

 63,360 BTU/Hr (maximum the 

space can support)

   

79,000 BTU/Hr (actual amount 

of BTU/Hr used)

The space in the example is a confined space 

because the actual BTU/Hr used is more than 

the maximum 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 adjoining 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

, in the Installation and 

Operation manual for the heater.

B.  Vent room directly to the outdoors. See 

Ventilation Air From Outdoors

, in the Instal-

lation and Operation manual for the heater.

C.  Install a lower BTU/Hr appliance, if lower 

BTU/Hr size makes room unconfined.

If the actual BTU/Hr used is less than the 

maximum BTU/Hr the space can support, the 

space is an unconfined space. You will need no 

additional fresh air ventilation.

COMBUSTION AND VENTILATION AIR

Содержание VRT3232WH

Страница 1: ...236WS VRT3242WS VRT3232WH VRT3236WH VRT3242WH WARNING If the information in this manual is not followed exactly a fire or explosion may resultcausingpropertydamage personalinjury or loss of life FOR U...

Страница 2: ...lified service person The heater should be inspected before use and at least annually by a professional service person More frequent cleaning may be required due to excessive lint from carpet ing bedd...

Страница 3: ...ON Packaging List Vent Free Gas Firebox Hood Installation and Operation Instructions GENERAL INFORMATION TheseVent Freefireboxenclosuresaredesigned toacceptallANSIZ21 11 2approvedDecorative TypeVent F...

Страница 4: ...s a space whose volume 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...

Страница 5: ...heaters shall provide to each purchaser a copy of 527 CMR 30 upon sale of the unit Not to Scale Figure 1 CAUTION Do not install in the vicinity where gasoline or other flammable liq uids may be stored...

Страница 6: ...ge we recommend the use of high temperature paint rated 175 F or higher on the underside of the mantel Clearances Ensure the minimum clearances shown in Figures 2 through 4 are maintained Left and rig...

Страница 7: ...rectlyonacombustiblesurface The appliance should be mounted on a fully supported base extending the full width and depth of the unit The appliance may be located on or near conventional construction m...

Страница 8: ...aming or into prepared framing Step2 Plumbgasline Gasconnectionsshould onlybeperformedbyanexperienced licensed certified tradesman Step 3 Install decorative type Vent Free room heater per the instruct...

Страница 9: ...l covering such as drywall is to be attached to the rear wall then the depth must be measured from the drywall surface It is important that this dimension be exact Step 2 Level the firebox by checking...

Страница 10: ...RT3242WH 42 1067 27 7 8 708 47 3 4 1213 37 1 4 947 29 1 2 749 20 508 3 77 3 3 16 81 15 7 8 404 7 1 2 191 12 305 1 3 8 35 5 1 2 140 30 3 8 772 29 5 8 753 Top View E F A C Front View Right Side View 2 3...

Страница 11: ...4 Table 1 This Table corresponds to Figures 7 8 and 9 A C D H F G E Rough Framing Face Unfinished Shown Back Wall Of Chase Enclosure Including Finishing Materials If Any Back Wall Of Chase Enclosure I...

Страница 12: ...rebox for safe operation for model VRT3232 series in all installations this part is optional for VRT3236 and VRT3242 models See Figure 11 These hood kits are design to be fitted to the face of the app...

Страница 13: ...fminorscratchesanddiscolorationoftheapplianceblackpaintedsurfaces may be accomplished with the touch up paint kit PA I N T APPROVED ACCESSORIES AND COMPONENTS Outside Air Gate Duct Kit Cat No ModelNo...

Страница 14: ...3 4 5 2 1 6 3 4 5 WARNING Failure to position the parts in accordance with these diagrams or failure to use only parts specifically approved with this appliance may result in property damage or perso...

Страница 15: ...natural or propane gas only Burning conventional fuels such as wood coal or any other solid fuel will cause damage to the Product will produce excessive temperatures and could result in a fire hazard...

Страница 16: ...rth Products IHP reserves the right to make changes at any time without notice in design materials specifications prices and the discontinuance of colors styles and products Consult your local distrib...

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