Gas or air flow regulators

(19)

(11)

EP 0 690 272 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	30.10.1996 Bulletin 1996/44

(43)	Date of publication A2:
	03.01.1996 Bulletin 1996/01

(21)	Application number: 95303677.9

(22)	Date of filing: 30.05.1995

(51)	International Patent Classification (IPC)⁶: F24F 13/14

(84)	Designated Contracting States:
	DE ES FR IT

(30)

Priority:

01.07.1994 GB 9413284

(71)	Applicant: DRAFTEX INDUSTRIES LIMITED
	Edinburgh EH3 6YY, Scotland (GB)

(72)	Inventor:
	Tournier, Pascal F-44300 Le Pallet (FR)

(74)	Representative: Foster, David Martyn et al
	MATHISEN MACARA & CO. The Coach House 6-8 Swakeleys Road Ickenham Uxbridge UB10 8BZ Ickenham Uxbridge UB10 8BZ (GB)

(54)	Gas or air flow regulators

(57) Apparatus is described for regulating the flow of gas or air under pressure between two regions (A,B). The apparatus comprises a wall (10) which separates the two regions (A,B) and which has an aperture (12) through which gas or air flow is regulated by a regulating flap (14). The apparatus is characterised by the provision of irregularities on one or more surfaces (22,24) adjacent to which the air or gas flows, the irregularities serving to reduce the generation of noise.

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