The recirculating filter/blower unit shall be "Quiet Air" by Nextek, LLC, Model Numbers BMT-10 or BMT-20 and shall operate at less than 60 dBA noise level.
The "Quiet Air" unit shall be constructed with 16 gauge galvanized steel. The blower shall be mounted on spring type vibration isolators. The blower compartment and plenum section shall be lined with a 2" thick sound isolating foam meeting Class I fire regulations.
The blower shall be 115 or 230 volt and shall be variable speed. A wall mounted control panel with a gage indicating final filter pressure drop, a speed controller, airflow indicator, and on/off switch shall be provided. The airflow indicator is to be activated by a pressure switch mounted on the unit.
The pre-filter shall be 55% efficient and shall be accessible from within the room through the return air grille. The final filter shall be 99.99% efficient on .3 micrometer particles and shall have a protective face plate installed on the room side to prevent accidental puncture.
The return air plenum is designed to mate with a typical 2' x 2' lay-in ceiling "T" bar.