sanders

Claim 1

A SUBSTANTIALLY NOISELESS INTEGRAL, FORCED-AIR VENTILATOR COMPRISING A CASING, A FIRST APERTURE IN ONE SIDE OF SAID CASING AND A SECOND APERTURE IN ANOTHER SIDE OF SAID CASING, SUBSTANTIALLY BAFFLE-FREE DUCT MEANS WITHIN AND SPACED FROM SAID CASING COMPRISING A FIRST SECTION COMMUNICATING WITH SAID FIRST APERTURE, A SECOND SECTION COMMUNICATING WITH SAID SECOND APERTURE AND A CENTRAL SECTION COMMUNICATING WITH SAID FIRST AND SECOND SECTIONS, ISOLATING MEANS, AN IMPELLER MOUNTED ON SAID ISOLATING MEANS IN THE REGION OF AND COMMUNICATING WITH SAID CENTRAL SECTION WHEREBY SAID IMPELLER IS ACOUSTICALLY AND DYNAMICALLY DECOUPLED FROM SAID CENTRAL REGION, ACOUSTIC ABSORBENT MEANS IN SAID SPACE BETWEEN SAID CASING AND SAID DUCT SECTIONS, ONE OF SAID SECTIONS HAVING A SINGLE PASSAGEWAY OF HIGH PERIMETER AREA RATIO, ONE OF SAID SECTIONS INCLUDING A BEND, AND SAID ISOLATING MEANS COMPRISING A RESILIENT IMPELLER MEMBER SANDWICHED BETWEEN A PLURALITY OF RESILIENT MOUNTING MEMBERS, SAID IMPELLER BEING MOUNTED IN SAID IMPELLER MEMBER, SAID MOUNTING MEMBERS INCLUDING INTEGRAL RESILIENT APPENDAGES FOR HOLDING SAID MOUNTING MEANS IN SAID VENTILATOR.