90-827 Decelerating Modification At Full Open/Close (M38 Mod)
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90-827 Decelerating Modification At Full Open/Close (M38 Mod) is available for shipping.
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Description
Description
Available only on door operators with Variable Speed Modification (M37). Provides an adjustable “ramp down” or soft stop at the full-open and full-close position.Recommended on very heavy doors, doors requiring speeds faster than normal or where high door usage is expected. Must be factory installed.
Many applications require non-standard door speeds or limit travel. By changing the door, operator or limit sprockets supplied with a commercial door operator, we are able to adjust the speed at which a door opens and closes. Also, by modifying limit sprockets, larger doors that require longer limit travel may also be addressed. Please consult your LiftMaster Sales Representative with your specific application for pricing and specifications. Not for use on Logic 5.0 Door Operators; mechanical operators only.
NOTE: Door will not “ramp down” when using stop button or reversed in mid-travel.
