| 摘要 |
A ventilator (10) has a housing (12) including an apertured wall portion (14) an exterior weather hood (16) and a cover portion (18). A rotatable flap (42) is pivotally mounted to the apertured wall portion (14). The cover portion (18) contains a reticulated foam filter (120). The cover portion (18) is removable from the apertured wall portion (14) for servicing or replacement of the filter (120). |
