Portable Ventilation System

Abstract

A portable ventilation system with a single centralized electric motor with two in-line drive shafts connected to two centrifugal fans directing air flow from inlet openings on the sides of the base unit, up into a vertically oriented fixed air plenum. A vertically oriented adjustable air plenum is positioned on and telescopes over the fixed air plenum to conduct a flow of air up from the base unit to an elevated height appropriate for exhausting the air flow into the environment. The adjustable air plenum redirects the air flow through a horizontal outlet. The adjustable air plenum may be set at a number of different positions on the fixed air plenum so as to vary the overall height of the system and the point at which the horizontal delivery of air flow is achieved. Heating elements may be incorporated into the airflow system.

I claim: 
     
         1 . A portable ventilation system comprising:
 a base unit comprising at least one fan motor and at least one centrifugal fan;   a fan enclosure comprising a walled enclosure defining an air flow inlet and a constriction air flow outlet;   a vertical fixed air plenum in air flow communication with the constriction air flow outlet of the fan enclosure;   a vertical adjustable air plenum positioned in air flow communication and telescoping engagement with the fixed air plenum; and   a horizontal air exhaust port connected to the vertical adjustable air plenum for exhausting a horizontal flow of air into the environment.