| Humidaire Company, Inc |
Phone: 215-467-4646 Fax: 215-467-1667 |
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The most common size V-Belt for General Purpose Applications Such as Residential HVAC Application and Light Commerial Applications |

The first number of the model number (example the number 4 in 4l300) represents the width of the belt in 1/8th of and inches (4 x 1/8" = 1/2 inch ) the "L" states that the coming number is the lenght ( 4L300 the 300 represnts aproximately 30.0 inches long). Some Manufactures, an ( older system )
| A | 1/2 inch |
| B | 5/8 inch |
| C | 3/4 inch |
| O | Round |
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