Commercial equipment: Bard identifies the Quiet Climate Flex C-Series as a “Commercial Product – Not intended for residential applications.”
Two-stage system: The C24/C30 models are part of Bard's “2 Stage Quiet Climate” series and use a two-stage scroll compressor.
High outdoor airflow: The C30 uses a 20-inch condenser fan rated at 1,900 CFM, powered by a 1/3-horsepower, 1,060-RPM variable-speed motor.
Commercial/institutional applications: Bard lists uses including modular offices, schools, telecommunications structures, portable structures, and correctional facilities.
Estimated 60–62 dBA at 13 feet: In direct correspondence regarding the C30, Bard/its distributor estimated outdoor sound at approximately 60–62 dBA at 13 feet—roughly the distance between the replacement HVAC unit and the neighboring property boundary.
Above applicable limits: The estimated 60–62 dBA exceeds the applicable property-line limits of 55 dBA daytime and 45 dBA nighttime, before accounting for any site-specific mitigation.
No unit-design solution: Bard stated that it has “no current unit design solution for reducing the sound in that specific unit.”
Site mitigation may be necessary: Bard identified relocating the unit, constructing a sound wall, or adding a lined condenser-air elbow as possible measures. Bard stated that a sound wall should be approximately 10 feet from the unit to maintain adequate airflow.
No guaranteed reduction from an elbow: Bard indicated that a lined condenser-air elbow may reduce some noise but could not quantify the reduction and cautioned against restricting condenser airflow.
“Quiet Climate” does not establish compliance: Although the unit incorporates sound- and vibration-reduction features, the product name and those features do not establish the sound level that will occur at a neighboring property.
Fan operation can vary: With optional Low Ambient Control, condenser-fan operation may involve cycling or variable-speed modulation, making representative operating conditions important when evaluating noise.
Compliance has not been demonstrated: Bard's information does not show that the C30 will meet the applicable limits at this location. Instead, the 60–62 dBA estimate at approximately 13 feet raises a substantial compliance concern.
Post-installation testing will be critical: Acoustic testing under representative operating conditions will be necessary to determine whether the completed installation actually complies with the applicable environmental noise limits.
