Conventional Combustion Air Supply

U.S. Installations

All Air from Inside the Building

The confined space shall be provided with TWO per- manent openings communicating directly with an additional room(s) of sufficient volume so that the com- bined volume of all spaces meets the criteria for a room large in comparison (NFGC). The total input of all gas utilization equipment installed in the combined space shall be considered in making this determina- tion. Each opening shall have a minimum free area of 1 in.2 per 1,000 BTUH (2,225 mm2 per kW) of the total input rating of all gas utilization equipment in the con- fined space, but not less than 100 in.2 (645 cm2). One opening shall commence within 12 in. (305 mm) of the top, and one opening shall commence within 12 in. (305 mm) of the bottom of the enclosure. The mini- mum dimension of air openings shall be not less than 3 in. (76 mm) in any direction.

All Air from Outdoors

The confined space shall communicate with the out- doors in accordance with one of the methods below. The minimum dimension of air openings shall not be less than 3 in. (76 mm) in any direction. Where ducts are used, they shall be of the same cross-sectional area as the net free area of the openings to which they connect.

1.Two permanent openings, one commencing within 12 in. (305 mm) of the top, and one com- mencing within 12 in. (305 mm) of the bottom of the enclosure, shall be provided. The openings shall communicate directly, or by ducts, with the outdoors or spaces (crawl or attic) that freely com- municate with the outdoors.

a.Where directly communicating with the out- doors or where communicating to the outdoors through vertical ducts, each open- ing shall have a minimum free area of 1 in.2 per 4,000 BTUH (550 mm2 per kW) of total input rating of all equipment in the enclosure.

b.Where communicating with the outdoors through horizontal ducts, each opening shall have a minimum free area of 1 in.2 per 2,000 BTUH (1,100 mm2 per kW) of total input rat- ing of all equipment in the enclosure.

2.One permanent opening, commencing within 12 in. (305 mm) of the top of the enclosure, shall be permitted where the equipment has clearances of at least 1 in. (25 mm) from the sides and back and 6 in. (152 mm) from the front of the appliance. The opening shall directly communicate with the out- doors or shall communicate through a vertical or horizontal duct to the outdoors or spaces that freely communicate with the outdoors, and shall have a minimum free area of:

a.1 in.2 per 3,000 BTUH (740 mm2 per kW) of the total input rating of all equipment located in the enclosure, and

b.Not less than the sum of the areas of all vent connectors in the confined space.

WARNING: Do not use the “one permanent opening” method if the equipment room is under negative pressure conditions.

Canadian Installations

CAUTION: All combustion air must be drawn from the air outside of the building; the mechanical equip- ment room must communicate directly with the outdoors.

1.Ventilation of the space occupied by the heater shall be provided by an opening(s) for ventilation air at the highest practical point communicating with the outdoors. The total cross-sectional area of such an opening(s) shall be at least 10% of the area required in 2. and 3. (below), but in no case shall the cross-sectional area be less than 10 in.2 (65 cm2).

2.For heaters using a barometric damper in the vent system there shall be a permanent air supply opening(s) having a cross section area of not less than 1 in.2 per 7,000 BTUH (320 mm2 per kW) up to and including 1 million BTUH, plus 1 in.2 per 14,000 BTUH (160 mm2 per kW) in excess of 1 million BTUH. This opening(s) shall be either located at or ducted to a point not more than 18 in. (450 mm) nor less than 6 in. (152 mm) above the floor level. The duct can also “goose neck” through the roof. The duct is preferred to be straight down and terminated 18 in. (450 mm) from the floor, but not near piping. This air supply opening require- ment shall be in addition to the air opening for ventilation air required in 1. (above).

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Raypak 1005 Conventional Combustion Air Supply, Canadian Installations, All Air from Inside the Building
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1005 specifications

Raypak is a prominent name in the heating industry, known for its innovative and efficient heating solutions for residential and commercial applications. The models 2005, 1005, and 1505 are notable offerings from Raypak, each designed to provide reliable performance, energy efficiency, and user-friendly operation.

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The 1005 model is an excellent choice for medium-sized pools and spas, offering a perfect balance of power and energy efficiency. One of its key features is the ability to operate quietly, making it suitable for residential areas where noise can be a concern. The 1005 employs a reliable gas burning system that maximizes fuel efficiency and provides fast heating. Its compact design also makes it easy to install, saving space while delivering exceptional performance.

The Raypak 1505 model is designed for versatility, catering to a wide range of heating requirements. One of its standout characteristics is its corrosion-resistant heat exchanger, which ensures long-lasting performance even in harsh environments. The 1505 also incorporates a user-friendly digital interface, allowing for easy operation and monitoring of temperature settings. It supports both natural gas and propane, providing flexibility to users based on their energy source preferences.

All three models—the 2005, 1005, and 1505—benefit from Raypak's commitment to energy efficiency. They are designed to meet stringent environmental standards while minimizing operational costs for the user. Additionally, their reliable safety features, such as pressure switches and safety valves, ensure safe operation across various conditions.

In summary, Raypak's 2005, 1005, and 1505 models exhibit a combination of efficiency, durability, and user-friendliness. With their advanced technologies and adaptable designs, these heaters are suitable for a wide array of heating applications, providing users with reliable solutions for their heating needs. Whether for residential or commercial use, Raypak's commitment to quality and innovation makes these models excellent choices for anyone seeking dependable heating solutions.
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