Heatcraft Refrigeration Products HCS manual Air Pressure Drops- Cabinets, Filters, Wet Coils

Air Pressure Drops- Cabinets, Filters, Wet Coils

Cabinet And Filter Air Pressure Drop

	Air Pressure Drop - inches of water			Air Velocity^ - Feet per minute
	Component		200	250	300	350	400	450	500	550	600
Cabinet:	V Style Cabinet^^		—	—	—	.10	.13	.16	.20	.24	.29
	Economizer Section^^		—	—	.02	.03	.03	.04	.05	.06	.07
Filters:	Throwaway	2" Depth	.05	.08	.11	.15	.19	.24	.28	——	——
flat & hi	35% Efficient , Pleated	2" Depth	.08	.10	.13	.16	.21	.25	.30	.37	——
capacity	Permanent, Aluminum, Cleanable	2" Depth	.03	.04	.06	.08	.10	.13	.15	.18	.21
flat, 4"	35% Efficient , Pleated	4" Depth	.06	.07	.10	.13	.17	.20	.25	.29	.34
	(60 - 65%) Efficient	21" Depth	.12	.16	.21	.26	.32	.38	.45	—	—
Filters:	Bag Filter	30" Depth	—	—	.19	.24	.28	.33	.37	.41	.44
		37" Depth	—	—	.12	.17	.23	.27	.33	.37	.41
Medium	(80 - 85%) Efficient	21" Depth	.14	.20	.26	.32	.38	.44	.51	—	—
	Bag Filter	30" Depth	—	—	.23	.28	.34	.40	.47	.51	.55
		37" Depth	—	—	.15	.21	.26	.32	.38	.45	.52
and	(90 - 95%) Efficient	21" Depth	.20	.28	.36	.44	.52	.61	.70	—	—
	Bag Filter	30" Depth	—	—	.32	.39	.46	.53	.60	.66	.72
		37" Depth	—	—	.22	.29	.36	.44	.54	.60	.68
High	(60 - 65%) Cartridge Filter	6" Depth	.15	.20	.26	.33	—	—	—	—	—
		12" Depth	—	—	.22	.28	.34	.41	.50	.58	.68
	(80 - 85%) Cartridge Filter	6" Depth	.22	.29	.37	.46	—	—	—	—	—
Efficiency		12" Depth	—	—	.26	.32	.38	.46	.55	.64	.74
	(90 - 95%) Cartridge Filter	6" Depth	.25	.34	.44	.56	—	—	—	—	—
		12" Depth	—	—	.29	.35	.42	.50	.59	.70	.82

The filter air pressure drop is for air through clean filters.

Type A (1/2" O.D.) Wet Coil Air Pressure Drop*								Type 5 (5/8" O.D.) Wet Coil Air Pressure Drop*
Rows	Fin	Air Velocity - Feet			per minute^				Rows	Fin	Air Velocity - Feet			per minute^
	Series	400	450	500	550	600	650			Series	400	450	500	550	600	650
	6	0.18	0.22	0.26	0.30	0.34	0.39			6	0.25	0.30	0.36	0.42	0.49	0.56
	8	0.22	0.27	0.32	0.37	0.42	0.48			8	0.31	0.37	0.44	0.52	0.60	0.68
3	10	0.26	0.32	0.37	0.43	0.50	0.56		3	10	0.36	0.44	0.52	0.58	0.67	0.79
	12	0.30	0.37	0.43	0.50	0.57	0.65			12	0.42	0.50	0.59	0.66	0.76	0.87
	14	0.34	0.41	0.49	0.56	0.64	0.73			14	0.45	0.54	0.64	0.74	0.85	0.97
	6	0.24	0.29	0.35	0.40	0.47	0.53			6	0.33	0.40	0.48	0.56	0.65	0.74
	8	0.30	0.36	0.43	0.50	0.57	0.65			8	0.41	0.50	0.59	0.69	0.80	0.91
4	10	0.35	0.43	0.51	0.59	0.67	0.77		4	10	0.48	0.58	0.69	0.81	0.93	1.06
	12	0.41	0.49	0.58	0.68	0.77	0.88			12	0.56	0.67	0.79	0.92	1.02	1.20
	14	0.46	0.56	0.66	0.76	0.87	0.99			14	0.63	0.75	0.89	1.03	1.14	1.34
	6	0.31	0.38	0.45	0.53	0.61	0.70			6	0.41	0.50	0.60	0.70	0.81	0.93
	8	0.39	0.47	0.56	0.65	0.74	0.84			8	0.51	0.62	0.74	0.86	0.99	1.13
5	10	0.46	0.55	0.65	0.75	0.86	0.97		5	10	0.60	0.73	0.87	1.01	1.12	1.32
	12	0.53	0.63	0.74	0.85	0.97	1.10			12	0.69	0.84	0.99	1.11	1.27	1.50
	14	0.59	0.71	0.83	0.95	1.09	1.22			14	0.78	0.94	1.11	1.24	1.42	1.68
	6	0.37	0.46	0.54	0.64	0.74	0.84			6	0.49	0.60	0.72	.84	0.98	1.12
	8	0.46	0.56	0.67	0.78	0.90	1.03			8	0.61	0.74	0.88	1.03	1.19	1.36
6	10	0.55	0.67	0.79	0.92	1.05	1.18		6	10	0.72	0.88	1.04	1.21	1.40	1.59
	12	0.63	0.77	0.90	1.04	1.19	1.34			12	0.83	1.01	1.19	1.38	1.59	1.80
	14	0.72	0.86	1.01	1.17	1.33	1.49			14	0.94	1.13	1.33	1.55	1.77	2.01
	6	0.51	0.62	0.74	0.87	0.99	1.12			6	0.66	0.80	0.96	1.12	1.30	1.49
	8	0.63	0.77	0.90	1.05	1.20	1.35			8	0.82	0.99	1.18	1.38	1.59	1.82
8	10	0.75	0.90	1.06	1.23	1.40	1.58		8	10	0.97	1.17	1.39	1.62	1.86	2.12
	12	0.86	1.03	1.21	1.40	1.59	1.79			12	1.11	1.34	1.58	1.84	2.12	2.41
	14	0.96	1.15	1.35	1.56	1.78	2.01			14	1.25	1.51	1.78	2.06	2.36	2.68

*Wet coil air pressure drop for air entering at 80 °F DB and 67 °F WB over rippled high efficiency fins. Inches of water. ^ Air velocity = CFM divided by coil or filter face area in square feet. See table at top of page 40.

^^ Use face area of large coil to calculate air speed through AHV cabinet and economizer section.

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