# US 4,399,741 A · Method of controlling room air flow into a fume hood

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- Number: US 4,399,741 A
- Document ID: US4399741A
- Status: Granted
- Kind: A
- Application number: 06/103,664
- Filed: 1979-12-14
- Granted: 1983-08-23
- Earliest claimed: 1979-12-14
- Assignees: Hamilton Industries, Inc.
- Inventors: Jon A. Zboralski
- Web page: https://patentgrep.com/patent/US4399741A

## CPC

- B08B 15/023: {Fume cabinets or cupboards, e.g. for laboratories}
- Y10T 137/87692: With common valve operator
- B08B: CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A method of controlling room air flow into a horizontal sash type laboratory fume hood. The method includes laterally moving a damper across a room air vent by means of horizontal motion of the sash so that the vent opens and closes in an inverse manner to the sash.

## Claims

### Claim 1

A method of controlling room air flow into a fume hood having a horizontally slidable sash and a room air vent comprising the steps of:
(a) horizontally sliding the sash to change a sash passage into the hood; and
(b) transmitting at least a portion of the sash's sliding movements to the left and at least a portion of the sash's sliding movements to the right into lateral movements of a damper moving the damper across the vent to change a vent passage in an inverse manner to the change in a sash passage;
wherein the method includes progressively opening and closing the sash while progressively closing and opening the damper, and further includes moving the sash a given horizontal distance before moving the damper, whereby the total travel of the sash is greater than the damper travel.

### Claim 2 (depends on 1)

A method as set forth in claim 1, wherein the method includes moving a bar member on one of the sash and damper between two laterally spaced abutment members on the other of the sash and damper.

### Claim 3 (depends on 2)

A method as set forth in claim 2, wherein the method includes moving a bar member on the sash into engagement with abutment members on the damper.