COMBUSTION AND VENTILATION PROVISIONS

WARNING: This heater shall not be installed in a confined space or unusually tight construction unless provisions are provided for adequate combustion and ventilation air.

Confined Space and Unconfined Space

The National Fuel Gas Code, ANSI Z223.1 defines a confined space as a space whose volume is less than 50 cubic feet per 1,000 Btu per hour (4.8m³ 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 Btu per hour (4.8m³ per kw) of the aggregate input rating of all appliances 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.

WARNING: If the area in which the heater may be operated is smaller than that defined as an unconfined space or if the building is of unusually tight construction, provide adequate combustion and ventilation air by one of the methods described in the National Fuel Gas Code, ANSI Z223.1, Section 5.3 or applicable local codes.

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 1 perm (6 x10- ¹¹ kg per pa-sec-m²) or less with openings gasketed or sealed, and

b.Weather stripping has been added to openable windows and doors, and

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

Instructions for determining maximum Btu’s for a room

Step 1

This calculation is for combustion and ventilation air provisions only and is not intended to be used for sizing for heating comfort. To determine the maximum Btu’s allowed for a given room size you will need to calculate the volume of the room in cubic feet. To perform this calculation, fill in the table below and multiply the room’s width, length and height to obtain the room volume in cubic feet.

ROOM

ROOM

ROOM

ROOM VOLUME

LENGTH

WIDTH

HEIGHT

IN CUBIC FEET

 

X

X

=

 

 

 

 

Example:If your room is 20 feet in length, 16 feet wide and has an 8 foot ceiling height, the calculation would be as follows: 20 x 16 x 8 = 2,560 cubic feet.

Step 2

Divide the room volume by 50 cubic feet to determine the maximum Btu’s per hour the room can utilize.

Example:Using the above example: 2,560 cubic feet divided by 50 = 51.2 x 1,000 = 51,200 Btu’s.

If the rate of your appliance plus any other gas appliances installed in the space is rated at more Btu’s than the example calculated above, you must follow instructions for confined space. See shaded WARNING above. If your appliance is rated at less Btu’s than the example calculated above, then your

area is considered unconfined space.

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Heatmaster HMDGII, HMDGJ manual Combustion and Ventilation Provisions, Confined Space and Unconfined Space

HMDGII, HMDGJ specifications

Heatmaster has established itself as a leader in high-performance outdoor wood-burning furnaces, with the HMDGJ and HMDGII models exemplifying their commitment to quality and innovation. Both units are designed to provide efficient, environmentally friendly heating solutions for residential and commercial applications, each with its unique features and advanced technology.

The HMDGJ model is known for its robust construction and user-friendly design. It features a unique "Dual Feed" system, allowing for the use of various fuels, including wood, pellets, and biomass, providing versatility and convenience for users. This model is equipped with a high-efficiency heat exchanger, which maximizes heat transfer while minimizing emissions, ensuring that more heat reaches your home and less escapes into the atmosphere. The HMDGJ also incorporates a state-of-the-art control system, allowing users to easily adjust settings and monitor performance through a digital display, making it an ideal choice for those who appreciate modern technology.

On the other hand, the HMDGII model boasts enhanced insulation and a larger firebox, which significantly increases the furnace's heating capacity. This model is perfect for larger properties or applications where high heat demand is essential. The HMDGII is designed with a high-temperature rating, allowing it to burn hotter for longer periods, which translates into less frequent refueling and increased efficiency. Similar to the HMDGJ, the HMDGII also features a digital control system that provides real-time data on temperature, fuel levels, and overall efficiency, enabling users to optimize performance effortlessly.

Both models are built with heavy-duty steel construction and are coated with high-temperature paint to resist corrosion and weathering, ensuring longevity and durability in outdoor settings. They also come equipped with user-friendly access doors for easy loading and maintenance.

With the Heatmaster HMDGJ and HMDGII, you can expect superior performance and reliability. Their commitment to efficiency not only reduces fuel usage but also minimizes environmental impact, making these furnaces a responsible choice for conscientious users. Whether for residential heating or larger commercial needs, Heatmaster’s HMDGJ and HMDGII provide innovative solutions that combine technology, efficiency, and ease of use for optimal heating comfort.