H2O Mechanics over a two year period produced what is now the Max Air 2000.  This unit is made of 5052-H32 aluminum and the filter chamber is hermetically sealed (no leaks during a smoke test).  What separates our filter from others is our automatic clamping system that is actuated by closing the filter chamber door.  The clamp action compresses the filter seal against a seamless metal lip that doesn’t allow particles to find an alternate path due to pressure drop across the filter.  Another valuable feature is the low leakage air valve that we manufacture for this product to regulate air velocity to the filter manufacturers' recommended flow rate.  We can also set any velocity and the Max Air system will automatically keep that velocity until the filter pressure loss indicates it’s time to change filters.  The Max Air is capable of flow rates > than 3000 cu ft/min with a MERV/15 24x24x11 inch filter.  We typically use a Baldor 3hp 3450 rpm motor and an extremely efficient fan assembly manufactured in Switzerland.  Every unit is tested for performance in our plant.  We build test, and crate every system right here in Newbury Ohio.  We have equipment in the USA, Malaysia, and Vietnam.