Abstract: A thermostatically controlled damper is provided for an attic vent pipe having a single piece pivoted damper plate moved from substantially a horizontal to substantially a vertical position by a movable mechanism contacting the plate at an acute angle to both the open and closed plate positions.

Abstract: A simple manually operable sanitary latch is provided to retain a cover on a pan while heating or for lifting the pan by the lid, as particularly useful in an environment such as a restaurant or hospital. The latch comprises two members, one being a U-shaped hook affixed to the cover at the edge, so that it goes under the upper lip of a mating pan. On an opposite edge of the cover is a movable latch member retained by a strap like bracket affixed substantially parallel to the cover, which permits the latch to move normally to the edge of the lid. This movable latch has an outermost hook for registering under the lip of the mating pan and an innermost abuttment member that restricts the extent of movement away from a latched position where the cover can be removed.