B
B.O.B DOLE
how do i measure the 3 degrees rise on the flue
You can get spirit levels that you can set the angles.
http://www.screwfix.com/app/sfd/cat/pro.jsp?id=79067&ts=39335
Never used one though always guessed the angle
http://www.screwfix.com/app/sfd/cat/pro.jsp?id=79067&ts=39335
Never used one though always guessed the angle
B
B.O.B DOLE
corgigazza said:
how would a fitter judge the incline of the flue
Fink of an equilateral triangle, OK? Internal angles are all 60º, all sides are length 1.
SO now fink of all those one degree lines drawn in, from one apex. The distance from the apex to the line opposite side is , in plumbing terms, also 1 (actually .866 or something I can't be bothered to work out).
SO every degree is represented, roughly, by a length of line equal to 1/60th.
SO a degree is about 1 in 60
,
3º is 1 in 20,
= a fingers thickness per foot.
Similarly, old bog pan outlets are 14º. 1 in 4 is much easier to work with!
If you've got your kid's cally handy, the ratio is
1 in 1/(tan[number of degrees])
SO now fink of all those one degree lines drawn in, from one apex. The distance from the apex to the line opposite side is , in plumbing terms, also 1 (actually .866 or something I can't be bothered to work out).
SO every degree is represented, roughly, by a length of line equal to 1/60th.
SO a degree is about 1 in 60
, 3º is 1 in 20,
= a fingers thickness per foot.
Similarly, old bog pan outlets are 14º. 1 in 4 is much easier to work with!
If you've got your kid's cally handy, the ratio is
1 in 1/(tan[number of degrees])
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