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Make-Up Air Units
More Heat, Less Energy
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Cambridge vs. Draw-Thru Make Up Air

(100% Outdoor Air - No Recirculation)

Distribution Center #1

Distribution Center #2

Building with Cambridge Heaters
Building with Makeup Air Units
1.3 million ft2 x 36' high, R-19 Roof/R-10 Walls
1.3 million ft2 x 36' high, R-19 Roof /R-10 Walls


Cambridge Heating System

Make-Up Air Heating System
(100% outside air)

  • •  (15) Direct Gas-   Fired Blow Thru™    Space Heaters
  • •  Rooftop Mounting
  • •  27,806 MBH Total
  • •  132,340 CFM Total
  • •  95 HP Total -    intermittent
  • •  (15) Direct Gas-   Fired Draw-Thru    Make-Up Air    Heaters
  • •  Rooftop Mounting
  • •  30,315 MBH Total
  • •  210,000 CFM Total
  • •  150 HP Total -    continuous

Gas Cost
Electric Cost
$ .75/therm
$ .08/kwh
$90,000
$1.00/therm
$ .10/kwh
$116,000
$1.25/therm
$.12/kwh
$155,000

Results:

The Cambridge Heating System used 36%
less total energy
.

If Distribution Center #2 had installed a high efficiency Cambridge System they could have saved