For chimney sizes up to 60cm x 30cm (24 x 12). The chimney balloon is effective mainly because of one single principle, warm air rises and cold air sinks. With the chimney balloon we can stop both a...
AdvantagesFun to make, good quality balloons
DisadvantagesA very high current price
DisadvantagesTricky to instal
DisadvantagesExpensive - but worth it