Why Pressurize?

Simply stated: to keep cold air out, moisture down, and to cut your fuel costs! Over 40% of heat loss in building s under construction is due to cold outside air seeping in through temporary enclosures, gaps in doors and windows, uninsulated walls, and other poorly sealed openings. Uncontrolled cold air leaking into a building, a common problem at constructing sights, is called "infiltration". Infiltration prematurely cools the inside air and traps moisture inside the building.

Pressurizing heaters solve the problem of infiltration by continually forcing more air into the building that it can hold. This is called "positive pressure" and it effectively seals all those uncontrolled cold air leaks by forcing moisture-laden air out. Since the pressure inside the building is greater than the pressure outside, cold air can't get in.

While this "pressure sealing" effect is desirable, it needs to be controlled. Too little pressure results in cold air leaks and locks moisture build-up inside; too much pressure wastes heat and consumes more fuel. Fortunately, pressure control is easy to achieve by accurately matching the output of the heaters to the volume of the building space. This is called "sizing", and our expertise at doing it is just one reason why knowledgeable contractors depend on AmeriTemp for efficient, cost-effective heating and moisture control.

Moisture control is major advantage of pressurizing heaters. Unlike re-circulating heaters that reheat the same air over and over, pressurizing heaters continually draw in new, cooler dryer air from the outside, heating it and forcing it into the interior. This hot, dry air draws moisture out of the air and/or fresh concrete and drywall. Positive internal pressure created by the heater's air flow expels the moisture-laden air out of the building through the natural gaps in the building envelope. This exclusion, called "exfiltration", is an essential feature of pressurized heating: minimizing condensation on exposed metal beams and surfaces that can cause "night rain".

Because pressurizing heaters pull in outside air they typically positioned at open doorways. This offers added benefits: "no heater clutter" inside work areas and no fuel hoses snaking across the work site floor. Also, since the heaters themselves are drawing outside air fossil fuel combustion gasses, like CO, CO2 and water vapors, won't build up inside the structure, creating health hazards and additional condensation.

Any heater can heat via re-circulation, but only a few -like ours- can pressurize. Heating is a function of BTU output, but the ability to pressurize is a function of airflow output measured in CFM (cubic feet per minute). Our pressurizing heaters deliver more CFM per BTU and that's why you need to consider when you are looking for an efficient heating solution. If you want the efficiency and cost-saving of pressurized heating, or have a special need for re-circulated heating, we have it!

The advantages of pressuration:

• 100% dryer outside air
• Lessens build-up of CO and CO2
• Better moisture Control no nightly rain (condensation)
• Aids and Drying
• Consistent temperature throughout
• Up to 40% fuel savings
• Reduced floor clutter

• De-Stratify Heat (Rotate the hot air along the roof/deck to mix with the cold air at lower elevations.
• Unmoved, air temperature will increase 1° to 1½° per foot).
• Save Fuel (Savings of 10 to 15% are common as the result of reusing the heated air accumulating on the ceiling).
• Improved Heat Distribution (Delivers warm air to "pocket" locations of dead air)
• Accelerates drying by removing excess moisture from a building.

• 70% relative Humidity
• The tank is 1/2 full
• Intermittent vapor withdrawal

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