Emberglow OVM21NG Installation Guide download pdf (Page 5)

Unusually Tight Construction

The air that leaks around doors and windows may provide

enough fresh air for combustion and ventilation. However, in

buildings of unusually tight construction, you must provide

additional fresh air.

Unusually tight construction is deﬁned as con-

struction 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

per pa-sec-m

) 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 penetra

tions 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

Ventila-

tion Air From Outdoors

, page 5

If your home does not meet all of the three criteria

above, proceed to

Determining Fresh-Air Flow for

Appliance Location

, page 6.

VENTILATION AIR

Ventilation Air From Inside Building

This fresh air would come from an adjoining unconﬁned

space. When ventilating to an adjoining unconﬁned space,

you must provide two permanent openings: one within 12"

of the ceiling and one within 12" of the ﬂoor on the wall

connecting the two spaces (see Figure 1). You can also

remove door into adjoining room (see Figure 1). Follow

the National Fuel Gas Code ANSI Z223.1/NFPA 54, Sec-

tion 5.3, Air for Combustion and Ventilation for required

size of ventilation grills or ducts.

Ventilation Air From Outdoors

Provide extra fresh air by using ventilation grills or ducts.

You must provide two permanent openings: one within

12" of the ceiling and one within 12" of the ﬂoor. Connect

these items directly to the outdoors or spaces open to the

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Follow the National Fuel Gas Code ANSI Z223.1/NFPA

54, Section 5.3, Air for Combustion and Ventilation for

required size of ventilation grills or ducts.

IMPORTANT: Do not provide openings for inlet or outlet

air into attic if attic has a thermostat-controlled power vent.

Heated air entering the attic will activate the power vent.

Remove

Door into

Adjoining

Room,

Option

Ventilation Grills

Into Adjoining Room,

Option 2

Ventilation

Grills

Into Adjoining

Room,

Option 1

12"

Figure 1 - Ventilation Air from Inside Building

Outlet

Air

Ventilated

Attic

Outlet

Air

Inlet

Air

Inlet Air

Ventilated

Crawl Space

Crawl

Space

To Attic

Figure 2 - Ventilation Air from Outdoors

DETERMINING FRESH-AIR FLOW

FOR APPLIANCE 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 appli-

ance 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) = 3168 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 maxi-

mum Btu/Hr the space can support.

_______ (volume of space) x 20 = (Maximum Btu/Hr

the space can support)

Example: 3168 cu. ft. (volume of space) x 20 =

63,360

(maximum Btu/Hr the space can support)

1 2 3 4 5 6 7 8 9 10 ... 25 26

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Emberglow OVM21NG Installation Guide Page 5

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