Related by context. Frequent words. (Click for all words.) 65 flue 63 chimneys 56 chimney 54 furnaces 53 pipework 53 boilers 53 ductwork 51 fireplaces 50 ventilation 50 dryer vent 49 air ducts 49 radiators 49 furnace 49 ducts 48 crawl spaces 47 vents 47 space heaters 47 wood burning stoves 47 boiler 46 wood stoves 45 pipes 45 gutters 45 ventilate 45 ventilated 45 carbon monoxide CO 45 floor joists 44 ducting 44 double glazing 44 glazed windows 43 guttering 43 fireplace 43 air intakes 43 stoves 43 exterior walls 43 staircases 43 baseboards 43 ventilating 42 condenser 42 enclosed spaces 42 confined spaces 42 heaters 42 humidifiers 42 joists 42 Smoke alarms 42 CO poisoning 42 walkways 41 duct 41 exhaust pipe 41 flammable materials 41 windowsills 41 sprinkler systems 41 cookers 41 insulators 41 sump pumps 41 Ventilation 41 sump pump 40 flanges 40 heating 40 stairways 40 gaskets 40 downspouts 40 smoke alarms 40 burning fireplaces 40 stairwells 40 exhaust pipes 40 heat exchanger 40 combustibles 40 wood stove 40 upper airway 40 insulation 40 cooling towers 40 airflow 40 compressors 40 louvers 39 combustible materials 39 hob 39 radiant heat 39 burners 39 fittings 39 heat exchangers 39 woodstove 39 doorways 39 attics 38 mold spores 38 radiator 38 eaves 38 mains 38 cornices 38 attic 38 dehumidifier 38 poorly ventilated 38 crankcase 38 dampers 38 airconditioning 38 smoke detectors 38 trusses 38 thermal insulation 38 passageways 38 carbon monoxide fumes 38 sump 38 carbon monoxide