Astria MM49VF Installation And Operation Instructions Manual - Page 11

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Interior Wall Materials:

Wall materials, such as drywall, should be set flush with

the rough front face of the Vent-Free fireplace. This will allow

for placement of required non-combustible surround material in

such a way that the surround material can lay flat against the

finished wall surface and also align with the leading edge of the

fire brick interior of the Vent-Free fireplace (see Figure 15).

Trim Facings:

Parts of the combustible mantle assembly located along

the sides of the firebox opening, which project more than one

and one-half inches (1-1/2") from the face of the fireplace, shall

be kept at least eight inches (8") from the firebox opening.

Adjoining Room Walls:

Interior wall surfaces of adjoining room walls must be at a

minimum horizontal measure of twenty four inches (24") away

from the finished opening of the Vent-Free fireplace.

Figure 14

FRAMING

8" MIN. NON-COMBUSTIBLE MATERIAL

Model

MM39VF

MM44VF

MM49VF

Figure 15

FRAMING

8" MIN. NON-COMBUSTIBLE MATERIAL

1-1/2"

43"

73-1/2"

48"

77"

53"

80-1/2"

1-1/2"

8" MIN

20"

MIN

Air for Combustion and Ventilation

Energy efficient homes require homes to be airtight but at the

same time provide sufficient fresh air to breathe. Fresh air

enters the home through air conditioning duct vents, around

doors and windows but also must provide enough fresh air for

proper combustion on all fuel-burning appliances in the home.

Exhaust fans, fireplaces, clothes dryers, and fuel-burning

appliances draw air from the house to operate. You must provide

adequate fresh air for these appliances. This will insure proper

venting of vented fuel-burning appliances.

Figure 16

Non-combustible

Flex Hose

Providing Adequate Ventilation

In accordance with the National Fuel Gas Code NFPA 54/ANSI

Z223.1, Section 5.3, Air for Combustion 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 following information 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 homes of unusually 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*

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

other openings.

* A perm is a unit of permeance or water vapor transmission,

the US perm-inch is defined as the passage of 1 grain of vapor

through 1 square foot of 1 inch thick material in 1 hour under a

pressure difference of 1 inch of mercury.

If your home meets all the three criteria above, you must provide

additional fresh air.

Exterior