Nordyne M1G, M1B, M1S Equivalent Orifice Sizes At High Altitudes, ¢708672¤, 7086720, O’Fallon, MO

21. EQUIVALENT ORIFICE SIZES AT HIGH ALTITUDES

(Includes 4% Input Reduction for Each 1,000 Feet)

FURNACE	ORIFICE SIZE AND					ALTITUDE - FEET
MODEL	OUTPUT CAPACITY	SEA LEVEL	2000	3000	4000	5000	6000	7000	8000	9000	10000
	ORIFICE SIZE - NAT. GAS	29	29	30	30	30	30	31	31	31	32
M1M/G 056	ORIFICE SIZE - LP	45	46	47	47	47	48	48	49	49	50
	OUTPUT- MBTUH	45.4	41.8	40.1	38.5	37.0	35.5	34.1	32.7	31.4	30.2
	ORIFICE SIZE - NAT. GAS	24	25	26	27	27	28	28	29	29	30
M1M/G 070	ORIFICE SIZE - LP	42	42	43	43	43	44	44	45	46	47
	OUTPUT- MBTUH	56.7	52.3	50.2	48.2	46.2	44.4	42.6	40.9	39.3	37.7
	ORIFICE SIZE - NAT. GAS	21	23	23	24	25	26	27	28	28	29
M1M 077	ORIFICE SIZE - LP	40	41	42	42	42	43	43	44	44	45
	OUTPUT- MBTUH	61.7	56.9	54.6	52.4	50.3	48.3	46.4	44.5	42.7	41.0
	ORIFICE SIZE - NAT. GAS	21	23	23	24	25	26	27	28	28	29
M1G 077	ORIFICE SIZE - LP	40	41	42	42	42	43	43	44	44	45
	OUTPUT- MBTUH	59.9	55.2	53.0	50.9	48.9	46.9	45.0	43.2	41.5	39.8
	ORIFICE SIZE - NAT. GAS	17	18	19	19	20	21	22	23	24	26
M1M 090	ORIFICE SIZE - LP	36	37	38	38	39	40	41	41	42	43
	OUTPUT- MBTUH	71.7	66.1	63.5	60.9	58.5	56.1	53.9	51.7	49.7	47.7
	ORIFICE SIZE - NAT. GAS	17	18	19	19	20	21	22	23	24	26
M1G 090	ORIFICE SIZE - LP	36	37	38	38	39	40	41	41	42	43
	OUTPUT- MBTUH	69.7	64.2	61.7	59.2	56.8	54.6	52.4	50.3	48.3	46.3
	ORIFICE SIZE - NAT. GAS	26	27	28	28	28	29	29	30	30	30
M1B 066	ORIFICE SIZE - LP	43	44	44	44	45	45	46	47	47	48
	OUTPUT- MBTUH	52.6	48.5	46.6	44.7	42.9	41.2	39.6	38.0	36.5	35.0
	ORIFICE SIZE - NAT. GAS	18	19	19	20	21	22	23	24	26	27
M1B 086	ORIFICE SIZE - LP	37	38	39	39	40	41	42	42	43	43
	OUTPUT- MBTUH	68.2	62.9	60.3	57.9	55.6	53.4	51.2	49.2	47.2	45.3

Table 12. High Altitude

Reference Sources: ANSI Z233.1 & NFPA 54, National Fuel Gas Code.

For Canadian high altitude (2,000 - 4,500'), reduce gas manifold pressure to 3.0” W.C. for

natural gas and 9” W.C. for LP gas.

NOTE: Do not attempt to change the size of an orifice by drilling it out. To do so will void the manufacturer’s warranty

INSTALLER: Please leave these installation instructions with the homeowner.

¢708672;¤

O’Fallon, MO

7086720

7086720 (Replaces 708074E)

Specifications and illustrations subject to change without notice and without incurring obligations.

Printed in U.S.A. (12/06)