Abstract: A smoke detector system includes a shielding structure enclosing a smoke detector, smoke detector circuit board or other contents. The shielding structure seals the contents from smoke, exhaust gasses, dust, chemicals, moisture, insects and other airborne particulates. The shielding structure is maintained sealed by a thermal bolt containing a thermal element which changes its state at a threshold temperature indicative of a developing fire and breaks the sealing of the shielding structure once the predetermined temperature has been reached. A lid of the shielding structure is held in place against a mounting plate by the thermal bolt. When the thermal bolt reaches the threshold temperature, it loses the integrity and allows the lid separation from the mounting plate to automatically open the shielding structure, thus allowing an internally mounted smoke detector or smoke detector circuit board to monitor the presence of smoke.

Abstract: A smoke detector system includes a shielding structure enclosing a smoke detector, smoke detector circuit board or other contents. The shielding structure seals the contents from smoke, exhaust gasses, dust, chemicals, moisture, insects and other airborne particulates. The shielding structure is maintained sealed by a thermal bolt containing a thermal element which changes its state at a threshold temperature indicative of a developing fire and breaks the sealing of the shielding structure once the predetermined temperature has been reached. A lid of the shielding structure is held in place against a mounting plate by the thermal bolt. When the thermal bolt reaches the threshold temperature, it loses the integrity and allows the lid separation from the mounting plate to automatically open the shielding structure, thus allowing an internally mounted smoke detector or smoke detector circuit board to monitor the presence of smoke.