For high heat loads, the circulating fans built into electronic equipment may not move sufficient air volumes to effectively cool the enclosure.  In that case, a separate blower drawer may be required to substantially boost air circulation for optimal cooling.

Blower drawers are available in three options:

All blower drawers have the same configuration (4 motor/fan assemblies mounted horizontally in parallel) and occupy an identical footprint within a standard 19” electronic enclosure.

The Military Rugged options use MIL-B-23071 compliant motors and incorporate proprietary designs that give them an extremely long service life (~30 years).  They include enclosed lubricated bearings making them significantly quieter than comparable alternatives.   We have the capacity to vary motor speed to balance both air flow and noise considerations, and can achieve 48 dB for a 4-motor blower drawer in some cases.  These design features, while appropriate for some applications, are also more expensive. 

The Commercial blower drawer provides comparable performance using readily available commercial components and is less expensive.