Abstract: A device for preventing blow back through the fuel loading door in stoves or heaters in which the rate of combustion is controlled by restricting the supply of air to the combustion chamber. When the stove is burning during normal operation the fuel loading door is closed and an air inlet to the combustion chamber is blocked by a pan member of the outer cabinet door. A thermostatic damper controls the rate of combustion in the combustion chamber by restricting the quantity of air supplied via other air intakes. When the outer cabinet door is opened to gain access to the fuel loading door, the pan member on the cabinet door is moved away from the air inlet to the combustion chamber thereby allowing additional air to enter the combustion chamber via the air inlet to the combustion chamber. The additional air supplied via this air inlet increases the rate of combustion prior to the opening of the fuel loading door.

Abstract: A mailbox of the type that is located outdoors and is exposed to all weather conditions has an access aperture with a door adapted to selectively open the aperture for removal of mail in the mailbox. A lock mounting arrangement is provided to permit the mailbox to be locked to prevent unauthorized removal of the mail. In addition, a mail slot sufficiently large to permit the insertion of mail but small enough to prevent access for removal of the mail is provided. A pivoted flap covers the mail slot. Appropriate shielding means, such as the top and sides of a specially shaped mailbox, protect the door, the mail slot and the lock mounting from inclement weather conditions.