| Patents for F23L 11 - Arrangements of valves or dampers after the fire (437) |
|---|
| 09/16/1980 | CA1085681A1 Device for draft control |
| 07/22/1980 | US4213477 Automatic damper for furnace vent pipe |
| 06/03/1980 | US4205783 Independent biasing means for automatic flue damper |
| 04/08/1980 | CA1075086A1 Draft control arrangement for combustion apparatus |
| 03/11/1980 | US4192310 Device in flue gas dampers |
| 03/04/1980 | US4191326 Draft control arrangement for combustion apparatus |
| 03/04/1980 | US4191171 Draft hood and damper assembly for fuel fired heating apparatus |
| 02/26/1980 | US4190197 Device for draft control |
| 02/19/1980 | US4189090 Automatic damper assembly |
| 01/29/1980 | US4185770 Automatic flue damper control system |
| 01/29/1980 | US4185769 Exhaust flue damper and control system therefor |
| 11/27/1979 | US4175695 Fail-safe stack damper control system |
| 11/20/1979 | US4174942 Flue control assembly |
| 08/21/1979 | US4164936 Damper |
| 08/14/1979 | US4164211 Damper assembly |
| 06/12/1979 | US4157785 Safety connection for a retrofit flue damper |
| 05/22/1979 | US4155699 Heat saving device for space heating furnace |
| 03/13/1979 | US4143811 Gas flow controlled furnace flue damper |
| 02/27/1979 | US4141495 Draft control arrangement for combustion apparatus |
| 02/06/1979 | US4138060 Automatic draft control |
| 01/30/1979 | US4136676 Flue box assembly |
| 10/10/1978 | CA1040183A1 Valve with spring gate |
| 10/03/1978 | CA1039558A1 Damper assembly for closing a duct for hot gases |
| 09/19/1978 | US4114805 Thermal damper assembly |
| 08/22/1978 | US4108369 Automatic flue damper |
| 08/15/1978 | CA1036692A1 Positive automatic draft control |
| 07/25/1978 | US4102629 Exhaust stack damper control |
| 03/21/1978 | US4079884 Energy-conserving flue damper |
| 03/07/1978 | US4077432 Purged valve |
| 09/06/1977 | US4046318 Automatic boiler damper |
| 05/10/1977 | US4022246 Damper assembly for closing a duct for hot gases |
| 05/03/1977 | US4020754 Cap-type flue damper |
| 04/05/1977 | US4015587 Fireplace damper operating mechanism |
| 10/26/1976 | US3987785 Energy saving device |
| 05/18/1976 | US3957001 Furnace implosion door |
| 04/20/1976 | US3951130 Isolating damper for closing a duct |
| 01/27/1976 | US3934796 Heating system with fuel saving draft retarder |