Abstract: A radon test package of simplified and low cost construction. A generally flat outer packet is formed from a single sheet of radon barrier material folded to define two panels with facing inner surfaces sealed along side edge portions, leaving a closeable open edge portion. The outer packet is expandable so as to define a chamber, having an access opening corresponding to the open edge portion. The facing inner surfaces have a surface layer of fusible low density polyethylene, and a sheet of gas-permeable kraft paper is adhered by heat sealing directly to the inner surface of one of the panels in an adhesion pattern which defines a closed triangular pocket containing activated charcoal. When the packet is expanded, the access opening is square, and a block of open cell foam material is inserted to maintain the opening in a standardized configuration, as well as to eliminate the effect of air currents.

Abstract: A radon detection package permits improved retention of radon, while limiting absorption of moisture which otherwise drives radon off from the package. A pouch of radon absorbing material is supported during a testing period, preferably in a vertical position, and substantially surrounded during such period by a hood-like envelope of radon impermeable material. The hood-like envelope includes an opening, preferably directed downward, which permits access of air and radon to the pouch of radon trapping material. A foldable cardboard wedge is inserted into the opening of the envelope structure for providing a channel along the pouch which admits air and radon into the package so as to controllably expose the pouch.

Abstract: An intake air pathway for a wood-burning stove is provided with a control mechanism which automatically responds both to changes in temperatures for controlling the amount of intake air flowing in the pathway and to pressure due to back puff conditions in the stove for closing the intake pathway with and thereby preventing emissions due to back puff. The point of control of the intake pathway may be placed along different points of the pathway. Control valve and check valve functions may be accomplished with a single control surface (i.e., plate or flap), or alternatively, be segregated into two control surfaces. The control arrangement is disposed such that gravity always acts as a safety feature to close the intake air pathway during an uncontrolled fire (e.g. chimney fire) or physical failure of the control apparatus. A fixed-shield baffle system surrounding a combustor of the stove causes reversals of combustion gasses and a secondary air flow supplied to the combustor.