The U.S. Consumer Product Safety Commission, in cooperation with Effikal LLC of Orion, Mich., announced a voluntary recall of about 45,000 automatic gas vent dampers. No incidents or injuries have been reported as of press time.

The recall involves Effikal RVGP-PC Gas Vent Damper size 4, 5, 6, 7, 8, 9 or 10, which are installed with the gas boiler systems listed below. The automatic gas vent damper could fail, and if the blocked vent switch does not activate, the vent could leak carbon monoxide, posing a risk of CO poisoning to consumers.

The vent damper date code is located on a sticker under the motor assembly cap on the plastic base. Serial numbers are located on a label on the side of the damper’s cap. All sizes and models of the RVGP-PC have the same motor assembly with black Effikal caps and black plastic bases.

The dampers were sold by plumbing and heating wholesale distributors to plumbers and contractors nationwide from August 2007 through July 2008 for between $1,000 and $4,000 for the boilers. Gas vent dampers were sold as part of the gas boiler systems.

Consumers should immediately stop using the boilers, weather permitting, and contact their installer to confirm they have a recalled vent damper and to receive a free vent damper replacement.

For additional information, contact Effikal toll-free at 866/790-3739, or visit the firm’s Web site atwww.effikal.com.

To see this recall on CPSC’s Web site, including pictures of the recalled products, go towww.cpsc.gov/cpscpub/prerel/prhtml09/09008.html.