What is the AFX Series Heater?

The AFX indirect-fired series is available either as an Aeroflo large air volume, high air delivery, floor mounted space heater or as a suspended automatic high volume heater. Both models are designed and applied as space heaters for modern open area buildings. They achieve uniform building temperature with maximum heating efficiency using the principle of low velocity constant air circulation to heat large air volumes to lower temperatures.The Aeroflo series heater is detailed in Bulletin AXF-1 while this brochure describes the suspended AFX model.

How Does the AFX Series Heater Function?

Continuously circulating the building's air volume several times each hour, the AFX series heater develops a gentle air rotation pattern, without requiring a duct system. The air circulation sweeps warmer ceiling air down to the comfort level, thereby minimizing the stratification.As the suspended heater does not interfere with normal building activity, AFX series high air supply system maintains room comfort by spreading lower temperature heat to all corners of the building. As illustrated in Figure 1 and 2, this does not happen with old style equipment which has been designed for a 70º-80º temperature rise. For tall buildings, inlet air ducts can be installed to provide low level return air.

How Does the AFX Series Heater Save Energy?

For several reasons, heating larger air volume  to lower temperatures in the AFX series heater reduces fuel consumption in comparison to old style unit heaters which raise smaller air volumes to higher temperatures.

• Burner operation is reduced because the high  volume air circulation minimizes air stratification, thereby returning warmer air to the heater.
• The larger air volume circulation also utilizes heat recovered from internal and solar gains normally found at the upper building levels.
• Transmission heat losses are reduced because of lower indoor -outdoor temperature differentials at the upper building levels.

The low air pressure drop through Hastings heat exchangers in combination with specially designed propeller fans results in the AFX series suspended heaters delivering high air volumes at considerably less motor horsepower than comparable blower type units.This reduces operating power costs.

New AFX Design with Low 26-40 Temperature Rise

Old Style Design with 70-80 Temperature Rise

Field Fabricated Return Air Duct

NOTE: Inlet duct should slip-over the outside of the fan inlet assembly. Some notching and slitting will be required by the sheet-metal installer. Secure ductwork to the fan assembly to suit.