US 7,544,122 B2
	Air shutter and installation method thereof
Sachio Ohwada, Koto-ku (Japan); Kouichi Tsubata, Koto-ku (Japan); Seiichi Sakuma, Koto-ku (Japan); Shinjirou Akaboshi, Koto-ku (Japan); and Akira Yasutome, Koto-ku (Japan)
Assigned to Mayekawa Mfg. Co., Ltd., Tokyo (Japan)
Filed on Apr. 05, 2006, as Appl. No. 11/397,881.
Application 11/397881 is a division of application No. 10/733756, filed on Dec. 12, 2003, granted, now 7,037,189.
Claims priority of application No. 2003-149544 (JP), filed on May 27, 2003.
Prior Publication US 2006/0199500 A1, Sep. 07, 2006
Int. Cl. F24F 9/00 (2006.01)

U.S. Cl. 454—191  [454/190; 454/192; 454/188]

2 Claims

1. An air shutter to be installed in front of a doorway where temperature difference exists between the inside and outside thereof in order to interrupt the flowage of air through the doorway to interrupt the flowage of air through the doorway, wherein a pair of gateposts is installed of which each gatepost is provided at each side of the doorway to oppose to each other, a duct for air passage being formed in each gatepost, each gatepost being provided with air spouting out openings and air sucking openings along the direction of height such that each of the air spouting out openings of one side gatepost faces, or is opposite to, each of the air sucking openings of the other side gatepost respectively, a plurality of fans being provided behind each of said air spouting out openings; one of the gatepost is provided with the air spouting openings and fans located in the upper part and in the lower part thereof; the other of the gatepost is provided with the air spouting openings and fans located in the middle part in the direction of height thereof; and air is spouted out from the air spouting openings toward the corresponding opposite air sucking openings.