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17979 State Route 536
Mt. Vernon, WA 98273
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3503 Bayliss MK7 Triple Spring Vent Opener (C3503)


This is a Charley's exclusive item, available only from Charley's Greenhouse.

Quantity pricing:
2 or more $69.95 each

2 extra closing springs

The Bayliss Triple Spring solar vent opener is the best choice for top hinged wall vents. It is also recommended for roof vents up to 2' x 4' in windy locations. The 2 extra springs will reduce vent flutter. Anodized aluminum finish. Special Orchid Vent Opener also available. (See 3505)

About Bayliss Solar-Powered Vent Controls
These "top of the line" solar vent controls will open and close greenhouse vents automatically without electricity. Bayliss vent openers convert energy from the warmth of the sun into mechanical energy to open vents. The hotter it gets, the wider the vents are opened.

Bayliss openers are made from the best corrosion resistant materials: brass, stainless steel and satin anodized aluminum. They are designed to give many years of service, are covered by a 2-year guarantee and can be repaired should the need arise.

The Bayliss can exert a force of 14 lbs. at the point where it is attached to the vent. A threaded adjuster bolt can set the Bayliss to start opening the vent at temperatures between 55º and 75ºF. Maximum opening of 12" is reached at approximately 20ºF above the starting temperature.
Openers can be installed in a series on a long vent to replace worn out electric vent motors. The adjuster bolt can equalize the loading so the lifters work in unison.

Easy to install with screws: top arm to vent, bottom arm to greenhouse frame. Illustrated directions included. Openers are about 12" long and fit neatly up close to the vent.

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To dis-engage opener:
To disable the the Bayliss opener when needed due to heavy winds or winter weather, simply unscrew the Threaded (knurled) Adjuster, remove it completely and keep the adjuster in a safe place for later use. The vent must be tied securely. You may put a zip-tie around the opener just up from the mounting brackets to lock the vent shut. When ready to engage the vent opener, cut the ties, re-install the Threaded Adjuster. Check to be sure screws are firmly attaching vent opener to the vent frame each season prior to use.

See Also
3505 Bayliss MK7 Orchid Vent Opener (C3505)
3509 Bayliss MK7 Hydraulicheck Vent Opener (C3509)
3506 Bayliss MK7 Orchid Replacement Power Tube (C3510 65 85)
3510 Bayliss MK7 Replacement Power Tube (C3510 55 75)
3541 Bayliss MK7 Super Replacement Power Tube (C3541)

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Learn More About
3503 Bayliss MK7 Triple Spring Vent Opener (C3503)

General Product Information:
This solar controlled automatic vent opener is the best choice for top hinged wall vents. Will open roof vents that measure 2’ x 4’. Adjustable temperature control from 55°F to 75°F. Opener exerts enough force to open vents weighing up to 14 lbs. Does excellent in windy conditions. Vent flutter is noticeably reduced due to the two extra springs in the vent openers’ design. Maximum opening of 12”.

Dimensions: 12” long
Color: Anodized aluminum

Shipping Information:
Standard shipping charges apply.

Some products will have PDF, Flash and QuickTime Video files available for your viewing pleasure. PDF, QuickTime & Flash files all require free third party viewers or players. If you need to download and install either Adobe Acrobat Reader for PDF files, QuickTime for QT Video files or Macromedia Flash to view Flash files, please visit our downloads page.

Adobe PDF Files

Easy to install with screws: top arm to vent; bottom arm to greenhouse. Illustrated instruction will be included.

Trouble Shooting:
Follow manufacturer’s instructions for chilling vent opener. Opener may need to be re-chilled if not opening at proper temperatures. Temperature may then be re-adjusted by turning knob on elbow ¼ turn for each degree to increase the temperature.
Note: ¼ turn for each degree to the left to decrease the temperature.

Check to be sure screws are firmly attaching vent opener to the vent frame each season prior to use.

Common Recommendations:
Used to open and close a hinged vent automatically using energy gained from the warmth of the sun or the surrounding air. The hotter the internal temperature gets, the wider the vent opens.

Replacement Part List:
Item # 3510 Bayliss Replacement Cylinder.

For further information, please contact Charley's Customer Service at 1-800-322-4707.

This item is backed by Charley's 100% guarantee. If you are not completely satisfied, return your purchase in the condition you receive it, within 30 days, for a refund, exchange or credit - whichever you prefer. If any product is found to be defective within the first year, it may be returned or exchanged for full credit.