| It is necessary to routinely lubricate the hinges on all tunnel doors. We recommend using ZEP Z-Works High Pressure Lubricant, and sell it by the bottle or by the case. Failure to lubricate the hinges could void the warranty. |
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Our durable tunnel ventilation doors now come with a rigid vinyl meeting rail, to prevent sweating. When installing the doors it is recommended to screw the meeting rail to the doors to prevent slippage with a couple of screws. |
