Flue Sizes Typically Used in Fireplaces

Standard Two Foot Flues
Nominal Size (In.)	Eff. Net Area (Sq. In.)	Weight (lbs.)	No. Per Pallet
8-1/2 x 8-1/2	49	36	72
8-1/2 x 13	76	50	60
13 x 13	127	66	40
13 x 18	173	99	24
18 x 18	233	141	18

Modular Two Foot Flues
Nominal Size (In.)	Eff. Net Area (Sq. In.)	Weight (lbs.)	No. Per Pallet
8 x 8	42	30	72
8 x 12	67	41	60
12 x 12	102	52	40
12 x 16	131	82	32
16 x 16	181	109	24
16 x 20	222	142	18
20 x 20	298	202	12
20 x 24	335	241	12
24 x 24	431	275	12

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