For instance, the chimney must connect directly to the heater. Regular thin walled stove pipe connections are not permitted. Since mobile home roofs are not built to the same specifications as house roofs extra care should be taken not to weaken the roof structure. A chimney cap and spark arrester are required. Be sure that the chimney is strong enough to withstand normal wind velocities in your area.
Some older homes have fireplaces in every room.
It is not uncommon to find four or more fireplaces with flues which merge into a common vent at some point above the fireplace openings. This was common practice in early house construction and posed no particular problem since chimneys were built with flue dimensions large enough to accommodate 4 fires. The loss of air through open fireplaces was of no consequence in houses without central heat. Venting more than one appliance into a common flue is still permitted in some states and localities. Multiple use of a single flue is dangerous, especially if a spark or burning soot or creosote has access to the house through an unused opening.