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Sound generation, sound dispersion and sound proofing in heat pumps

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of German Engineers VDI 3731, Sheet 2 [[planning:building_services:heating_and_dhw:heating:heat_pumps#liter... circulation device connected with it: [[planning:building_services:heating_and_dhw:heating:heat_pumps:Excit... ]] {{:picopen:members_only.png?25|}} [[planning:building_services:heating_and_dhw:heating:heat_pumps:Sound... ]] {{:picopen:members_only.png?25|}} [[planning:building_services:heating_and_dhw:heating:heat_pumps:Analy