Important Mechanical code for Duct Design and Installation

(1) Establishment of normal construction and duct. The Air-India distribution system has been designed to install the air supply and distribution of need protection requirements of the establishment of air distribution system shall not affect the specified in fire. Will manufacture ducts international building code, since for establishing is reinforced and structural and durability. (2) duct sizing. Within a house, development manual installed ducts unit size of the establishment or other instructions appliance ACCA approved the manufacturer. All other buildings of installed ducts within the handbook for disciplinary authorities ASHRAE equivalent or other elements of computation process. (3) may be classified duct ducts is classification based on 0.5, 1.0 the pressure of maximum operation or negative pressures, 2.0, 3.0, 4.0, 6.0 positive duct and 10.0 inches (PA) = 1 inch workmen's compensation water column of  ;- fication would equal or more pressure of ducts class are using the design, which air distribution ducts (4) metallic  role. Will manufacture metallic ducts SMACNA HVAC specified in construction- Stan duct dards metal and flexible single ducts within economical dwelling units installed: Exceptions, at least thickness fasteners specified in the table. Yan mechanically will be done by belied ducts metallic round at least three almost equally spaced rivets instrument metal sheet or joint. Exception: Where duct connection is made difficult, three instrument that partly or rivets minimum would be constructed of metal sheet Table 4 duct thickness of single dwelling UNIT Sa

Isometric view

 Top view

ROUND DUCT DIAMETER (inches)	STATIC PRESSURE
	1/ -inch water gauge 2		1-inch water gauge
	Thickness (inches)		Thickness (inches)
	Galvanized	Aluminum	Galvanized	Aluminum
< 12	0.013	0.018	0.013	0.018
12 to14	0.013	0.018	0.016	0.023
15 to 17	0.016	0.023	0.019	0.027
18	0.016	0.023	0.024	0.034
19 to 20	0.019	0.027	0.024	0.034
RECTANGULAR DUCT DIMENSION (inches)	STATIC PRESSURE
	1/ -inch water gauge 2		1-inch water gauge
	Thickness (inches)		Thickness (inches)
	Galvanized	Aluminum	Galvanized	Aluminum
≤ 8	0.013	0.018	0.013	0.018
9 to10	0.013	0.018	0.016	0.023
11 to 12	0.016	0.023	0.019	0.027
13 to 16	0.019	0.027	0.019	0.027
17 to 18	0.019	0.027	0.024	0.034
19 to 20	0.024	0.034	0.024	0.034

ROUND DUCT DIAMETER
(inches) STATIC PRESSURE
1/ -inch water gauge
2 1-inch water gauge
Thickness (inches) Thickness (inches)
Galvanized Aluminum Galvanized Aluminum
< 12 0.013 0.018 0.013 0.018
12 to14 0.013 0.018 0.016 0.023
15 to 17 0.016 0.023 0.019 0.027
18 0.016 0.023 0.024 0.034
19 to 20 0.019 0.027 0.024 0.034


RECTANGULAR DUCT DIMENSION
(inches) STATIC PRESSURE
1/ -inch water gauge
2 1-inch water gauge
Thickness (inches) Thickness (inches)
Galvanized Aluminum Galvanized Aluminum
≤ 8 0.013 0.018 0.013 0.018
9 to10 0.013 0.018 0.016 0.023
11 to 12 0.016 0.023 0.019 0.027
13 to 16 0.019 0.027 0.019 0.027
17 to 18 0.019 0.027 0.024 0.034
19 to 20 0.024 0.034 0.024 0.034
For SI: 1 inch = 25.4 mm, 1-inch water gauge = 249 Pa.
a. Ductwork that exceeds 20 inches by dimension or exceeds a pressure of 1-inch water gauge shall be constructed in accordance with SMACNA HVAC Duct Construction Standards—Metal and Flexible.