MH INDUSTRIAL EXHAUST FANS - Aerovent
MH INDUSTRIAL EXHAUST FANS - Aerovent
MH INDUSTRIAL EXHAUST FANS - Aerovent
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Optional Construction<br />
Heat Fans<br />
<strong>MH</strong> fans can be used for operation at elevated temperatures<br />
provided certain modifications are made.<br />
The effect of various temperatures on material strength<br />
must also be considered.<br />
Maximum temperatures for each arrangement and fan<br />
modifications to meet these conditions are given in Table 2.<br />
Safe speed limits at various temperatures for each fan size are<br />
listed in Tables 3 and 4.<br />
Two-Piece<br />
Aluminum<br />
Heat Slinger<br />
Table 2. Maximum Temperature & Modifications<br />
ARR. MAX. TEMP.<br />
NO. STD. MODIFIED<br />
MODIFICATIONS<br />
1 300°F 600°F* HEAT SLINGER & GUARD<br />
8 300°F 600°F* HEAT SLINGER & GUARD<br />
9 300°F 600°F<br />
HEAT SLINGER, SLINGER GUARD<br />
& MOTOR HEAT SHIELD<br />
10 200°F 600°F<br />
HEAT SLINGER, SLINGER GUARD<br />
& MOTOR HEAT SHIELD<br />
High temperature bearing lubrication, grease or oil, and heat resistant<br />
aluminum paint are included in the above modifications for all<br />
arrangements.<br />
Table 3. Max. Safe Wheel Speeds from 70°F to 400°F,<br />
Steel Wheels<br />
Slinger Guard<br />
Heat Slinger & Guard<br />
Arrangement<br />
SIZE<br />
BW WHEEL OW WHEEL AW WHEEL<br />
STD. HEAVY STD. HEAVY STD. HEAVY<br />
12 4621 5718 4621 6171 4621 6184<br />
14 4098 5070 4098 5465 4098 5465<br />
16 3638 4494 3638 4876 3638 4863<br />
18 3233 4003 3233 4321 3233 4311<br />
20 2913 3601 2913 3883 2917 3882<br />
22 2606 3218 2606 3472 2601 3465<br />
25 2317 2855 2317 3082 2310 3080<br />
28 2060 2541 2060 2733 2050 2733<br />
32 1824 2243 1824 2425 1819 2435<br />
35 1617 2001 1617 2157 1617 2156<br />
39 1461 1801 1461 1940 1456 1944<br />
44 1300 1612 1300 1736 1304 1740<br />
49 1164 1444 1164 1563 1168 1556<br />
55 1039 1293 1039 1400 1039 1386<br />
63 910 1127 910 1213 911 1216<br />
71 — — 808 1082 808 1078<br />
79 — — 732 978 728 970<br />
Corrosion Resistance<br />
Corrosion problems result when the air contains one or<br />
more chemicals which are corrosive in nature. The extent<br />
of the corrosion problem, however, varies with the specific<br />
properties of the chemical involved, the concentration,<br />
moisture, and temperature of the mixture. Protective coatings<br />
and special construction are available to combat corrosion<br />
problems. (See page 11 for further details.)<br />
Special Metal Construction — <strong>MH</strong> fans can be<br />
constructed of aluminum or various stainless steels.<br />
Thin Film Coatings (5 to 10 mils thickness) — Special<br />
paints and spray coatings are available under a variety of trade<br />
names. <strong>Aerovent</strong> works with coating applicators who can<br />
supply most brands or their equiv-alents. Standard <strong>MH</strong> fans<br />
with all-welded construction are especially suited to these<br />
coatings.<br />
Table 4. Max. Safe Wheel Speed Correction Factors<br />
for Standard Steel & Alloy Wheel Construction<br />
MATERIAL 70°F 200°F 300°F 400°F 500°F 600°F<br />
STEEL 1.00 1.00 1.00 1.00 0.96 0.94<br />
ALUMINUM 1.00 0.97 — — — —<br />
304 S.S. 1.00 0.89 0.82 0.78 0.75 0.73<br />
316 S.S. 0.95 0.92 0.88 0.86 0.83 0.80<br />
347 S.S. 1.00 1.00 0.99 0.97 0.97 0.97<br />
7 <strong>Aerovent</strong> Bulletin 705
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