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ductwork estimation ?

ductwork estimation ?

ductwork estimation ?

(OP)
hi friends

what is the equation i must used to estimate ductwork and insulation by square feet method ?

any articles will be gratefull

thanks for all

RE: ductwork estimation ?

osama800,

I'm sorry, but your question is much too vague / broad to be answered.  Perhaps you could give a few more details, explaining exactly what it is you need help with?

Brian

RE: ductwork estimation ?

(OP)
hi friends:

i need estimate duct system for a/c and the owner want from me estimate the cost per square feet so i need your help
to estimate the quantites  for this dimenstion :

30 feet * 20 feet (dimension of duct )for 15 feet

best regards

RE: ductwork estimation ?

(OP)
hi friends:

 i need estimate duct system for a/c and the owner want from me estimate the cost per square feet so i need your help
to estimate the quantites for sheets and  man . hours units required  for this dimenstion :

30 feet * 20 feet (dimension of duct )for 15 feet

best regards

RE: ductwork estimation ?

That is one big duct.  Are you sure it is 30 feet by 20 feet?  RS Means doesn't go up that large calculating the weight per SF.  

RE: ductwork estimation ?

(OP)
hi friends:

thanks for all

my queation is very easy
i estimated the ductwork by weight but i get in one project
the owner want from me the cost per square feet .
how can i calculate it ????

best regards

RE: ductwork estimation ?

(W + H) x 2 x L

W = Width of the duct
H = Height of the duct
L = Length of the duct

i.e. you multiply the perimeter of the duct by the length fo the duct to arrive at the area.

Please check whether you have stated the units correctly.  i.e is it a 30 feet x 20 feet duct ???!!!

HVAC68

RE: ductwork estimation ?

(OP)
hi friends:

thank u very much for your valuable equation HVAC68.

now if i want to estimate the quantity of insulation what is equation i must used ?

if the duct is round in this case what is the equation i must used to estimate (the cost per square feet)?

thanks again for your equation

best regrds

RE: ductwork estimation ?

Calculate the perimeter and multiply by the length.

For a circular duct, the perimeter would be 2?R, where R is the radius.

HVAC68

RE: ductwork estimation ?

It should read as 2 (pie) R.  i.e. 2 x 3.14 x R

HVAC68

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