{"id":9104,"date":"2023-06-27T15:06:43","date_gmt":"2023-06-27T12:06:43","guid":{"rendered":"https:\/\/vallox.com\/tuki-ja-ohjeet\/usein-kysyttya\/"},"modified":"2026-08-10T12:37:31","modified_gmt":"2026-08-10T09:37:31","slug":"frequently-asked-questions","status":"publish","type":"page","link":"https:\/\/www.vallox.com\/en\/support-and-instructions\/frequently-asked-questions\/","title":{"rendered":"Frequently asked questions"},"content":{"rendered":"\n

On this page, we have compiled the most frequently asked questions and answers related to ventilation and Vallox products. These frequently asked questions help you to quickly find answers to topics such as the operation, settings, commissioning, and troubleshooting of ventilation units. We update the FAQ page regularly so that you can find up-to-date information in one place.<\/p>\n\n\n

\n \"Frequently\n <\/div>\n\n\n\n

Purchasing a MyVallox ventilation unit<\/h2>\n\n\n \n
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What should be considered when choosing the right ventilation unit model? <\/h4>\n
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  1. Airflow\u00a0capacity<\/span><\/b>:\u00a0Choose\u00a0a\u00a0ventilation\u00a0unit\u00a0with\u00a0airflow\u00a0rates\u00a0that\u00a0match\u00a0the\u00a0size\u00a0of\u00a0your\u00a0home and\u00a0its\u00a0ventilation\u00a0requirements.<\/span>\u00a0<\/span><\/li>\n
  2. Energy\u00a0efficiency<\/span><\/b>: Select a\u00a0ventilation\u00a0unit\u00a0with\u00a0a\u00a0high\u00a0heat\u00a0recovery\u00a0efficiency.<\/span>\u00a0<\/span><\/li>\n
  3. Versatile\u00a0control\u00a0options<\/span><\/b>: Make sure\u00a0the\u00a0ventilation\u00a0unit\u00a0can\u00a0be\u00a0controlled\u00a0in\u00a0the\u00a0way\u00a0that\u00a0suits\u00a0you\u00a0best,\u00a0such\u00a0as\u00a0with\u00a0a\u00a0wall-mounted\u00a0control\u00a0panel, a\u00a0kitchen\u00a0cooker\u00a0hood,\u00a0remotely\u00a0via\u00a0your\u00a0mobile\u00a0device,\u00a0or\u00a0integrated\u00a0into a home\u00a0automation\u00a0system.<\/span>\u00a0<\/span><\/li>\n
  4. Automation<\/span><\/b>:\u00a0Ensure\u00a0that\u00a0the\u00a0unit\u00a0includes\u00a0advanced\u00a0defrosting\u00a0automation\u00a0and\u00a0built-in\u00a0indoor\u00a0air\u00a0quality\u00a0sensors.<\/span>\u00a0<\/span><\/li>\n
  5. Noise\u00a0level<\/span><\/b>:\u00a0Choose\u00a0a\u00a0ventilation\u00a0unit\u00a0that\u00a0operates\u00a0as\u00a0quietly\u00a0as\u00a0possible,\u00a0especially\u00a0if\u00a0it\u00a0will\u00a0be\u00a0installed\u00a0in\u00a0the\u00a0kitchen,\u00a0bathroom,\u00a0utility\u00a0room,\u00a0or\u00a0walk-in\u00a0closet.<\/span>\u00a0<\/span><\/li>\n
  6. Filter\u00a0availability<\/span><\/b>: Make sure\u00a0that\u00a0compatible\u00a0replacement\u00a0filters\u00a0are\u00a0readily\u00a0available. Original\u00a0manufacturer\u00a0filters\u00a0are\u00a0generally\u00a0the\u00a0best\u00a0option.<\/span>\u00a0<\/span><\/li>\n
  7. Serviceability\u00a0and\u00a0durability<\/span><\/b>:\u00a0Consider\u00a0how\u00a0easy\u00a0the\u00a0unit\u00a0is to\u00a0maintain\u00a0and\u00a0clean,\u00a0so\u00a0that\u00a0its\u00a0performance\u00a0and\u00a0cleanliness\u00a0can\u00a0be\u00a0preserved\u00a0over\u00a0the\u00a0long\u00a0term.<\/span>\u00a0<\/span><\/li>\n<\/ol>\n

    All\u00a0Vallox\u00a0ventilation\u00a0units\u00a0meet\u00a0the\u00a0above\u00a0requirements\u00a0and\u00a0features.<\/span>\u00a0<\/span><\/p>\n\n <\/span>\n <\/div>\n <\/details>\n \n \n

    How do I know which Vallox 125 CFi model is suitable to replace my old unit?<\/h4>\n
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    The different Vallox 125 CFi models have duct outlet configurations that match many older ventilation unit models, or they require only minor ductwork modifications. The letter in the unit name (A-H<\/strong>) indicates the model type, meaning the arrangement and location of the duct outlets.<\/p>\n

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    In addition, you must verify the unit’s handedness (left-hand or right-hand version)<\/strong>, which determines the orientation of the duct outlets in the top section of the unit.<\/p>\n

    The appropriate replacement model for an existing unit can be checked using the compatibility table (PDF)<\/strong>.<\/p>\n

    For example, the 125A<\/strong> model has the same duct outlet layout as the MUH Ilmava 100<\/strong>, MUH Ilmava 120<\/strong>, and Vallox 121 SE\/MC<\/strong> units. These models can therefore be replaced directly with a Vallox 125 CFi<\/strong> unit without any ductwork modifications<\/strong>.<\/p>\n<\/div>\n\n <\/span>\n <\/div>\n <\/details>\n \n \n

    How does the constant airflow feature work?<\/h4>\n
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    A standard ventilation unit adjusts the fan speed but cannot compensate for airflow changes caused by factors such as a window being left open temporarily or reduced airflow due to dirty filters.<\/p>\n

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    A MyVallox ventilation unit equipped with the constant airflow feature<\/strong> maintains balanced airflow under all conditions by compensating for pressure differences caused by external factors.<\/p>\n

    For example, when a filter becomes dirty, the unit automatically increases airflow in the direction of the clogged filter to compensate for the increased resistance, thereby maintaining balanced supply and exhaust air volumes.<\/p>\n<\/div>\n\n <\/span>\n <\/div>\n <\/details>\n \n \n

    What do the abbreviations CFi, MV, MC, SE, K, VKL, R, and L mean?<\/h4>\n
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    The abbreviations CFi, MV, MC, and SE<\/strong> that appear after the product name of a Vallox ventilation unit refer to the unit\u2019s control system or operating method.<\/p>\n

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    • CFi<\/strong>: The letters CF<\/strong> stand for Constant Flow<\/strong>, meaning the unit maintains constant airflow. The \u201ci\u201d<\/strong> stands for Intelligent<\/strong>, referring to the smart total-airflow control that makes commissioning and setup easier than before.<\/li>\n
    • MV, MC, and SE<\/strong>: These abbreviations indicate the unit’s control system:\n
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      • MV<\/strong> = MyVallox Control<\/strong><\/li>\n
      • MC<\/strong> = Simple Control<\/strong><\/li>\n
      • SE<\/strong> = Controlled with a Vallox Digit SED<\/strong> controller<\/li>\n<\/ul>\n<\/li>\n
      • K<\/strong>: Indicates a ventilation unit with an integrated cooker hood<\/strong>.<\/li>\n
      • VKL<\/strong>: Refers to a model equipped with a water-based post-heating coil<\/strong>.<\/li>\n
      • R<\/strong> and L<\/strong>: These letters indicate the unit\u2019s handedness (orientation)<\/strong>.\n
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        • R (Right-hand model)<\/strong>: Outdoor air enters the unit from the right side<\/strong> of the center line.<\/li>\n
        • L (Left-hand model)<\/strong>: Outdoor air enters the unit from the left side<\/strong> of the center line.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

          The locations of the other duct connections are correspondingly mirrored from one side to the other.<\/p>\n<\/div>\n\n <\/span>\n <\/div>\n <\/details>\n \n \n

          What is the difference between AC and EC fans?<\/h4>\n
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