{"id":27602,"date":"2026-07-12T17:45:26","date_gmt":"2026-07-12T14:45:26","guid":{"rendered":"https:\/\/filtrupasaulis.lt\/?post_type=product&#038;p=27602"},"modified":"2026-10-24T15:15:06","modified_gmt":"2026-10-24T12:15:06","slug":"vallox-121-se-mc-filter-set-no-21-g4g4f7-original","status":"publish","type":"product","link":"https:\/\/filtrupasaulis.lt\/en\/product\/vallox-121-se-mc-filter-set-no-21-g4g4f7-original\/","title":{"rendered":"Vallox 121 SE\/MC filter set No. 21 G4+G4+F7 (original)"},"content":{"rendered":"<h2>Model compatibility<\/h2>\n<p>Compatible with the following models:<\/p>\n<ul>\n<li>Vallox 121 SE<\/li>\n<li>Vallox 121 MC<\/li>\n<\/ul>\n<p>In Lithuania, new homes built since 2021 must meet energy class A++, so almost every new house has an MVHR unit \u2013 and its filters need replacing regularly.<\/p>\n<h2>What this filter set protects against<\/h2>\n<p>The filter set includes <b>3 filters<\/b> of different efficiency classes:<\/p>\n<ul>\n<li>2 \u00d7 G4 filters (Coarse 75%) \u2013 for coarse-particle filtration and MVHR protection<\/li>\n<li>1 \u00d7 F7 filter (ePM1 55%) \u2013 for incoming-air filtration and indoor air protection<\/li>\n<\/ul>\n<p>This filter set follows the ISO 16890 standard for particle filtration efficiency. The <b>G4 filters<\/b> capture approximately 75% of coarse airborne particles, including household dust, larger pollen grains, fibres, sand, sawdust, plant debris and insects. They help reduce dirt accumulation inside the ventilation unit, keeping the heat exchanger, fans and air ducts cleaner. This supports efficient airflow, reduces unnecessary strain on the system and helps extend the unit\u2019s service life.<\/p>\n<p>The <b>F7 filter<\/b> captures approximately 55% of fine particles as small as 1 micron, including fine pollen, mould spores, bacteria-carrying particles, smog, combustion dust and smoke particles. It cleans incoming outdoor air before it enters your home, helping improve indoor air quality and providing additional protection for people affected by allergies or respiratory sensitivities.<\/p>\n<h2>Usage and maintenance<\/h2>\n<p>To ensure optimal air quality and reliable ventilation-system performance, inspect the filters regularly and replace them when they become dirty or clogged. Under typical operating conditions, filters should usually be replaced every <b>3\u20136 months<\/b>. However, replacement frequency may vary depending on factors such as:<\/p>\n<ul>\n<li><b>Air pollution levels<\/b> (e.g. urban vs rural areas)<\/li>\n<li><b>Allergies or respiratory sensitivities<\/b><\/li>\n<li><b>Indoor pets or smoking<\/b><\/li>\n<li><b>Dust from nearby construction sites<\/b><\/li>\n<\/ul>\n<p>If your system includes a <b>filter change indicator<\/b>, follow its alerts. Otherwise, check the filters visually \u2013 if they appear very dirty or clogged, it is time to replace them.<\/p>\n<p>A handy rule of thumb in Lithuania: always replace the filters in autumn, before the heating season, and in spring, before the birch trees flower in April\u2013May, when the air carries the most pollen.<\/p>\n<h2>Manufacturing quality<\/h2>\n<p>This is an <b>original Vallox filter set manufactured by Vallox<\/b> for compatible Vallox 121 SE and Vallox 121 MC ventilation units. Original filters are produced according to the ventilation-unit manufacturer\u2019s technical requirements, helping maintain the intended airflow, filtration performance and energy efficiency of the system.<\/p>\n<p>The set combines synthetic filter-material elements with a panel filter manufactured using <b>Z-line technology<\/b>. The folded filter structure increases the effective filtration surface area, improving particle capture and dust-holding capacity while maintaining suitable airflow through the ventilation unit. By using <b>original Vallox filters<\/b>, you help ensure that your MVHR system continues to operate according to the manufacturer\u2019s stated technical specifications.<\/p>\n<h2>Original product codes<\/h2>\n<ul>\n<li>3422900<\/li>\n<li>7911902<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Model compatibility Compatible with the following models: Vallox 121 SE Vallox 121 MC In Lithuania, new homes built since 2021 must meet energy class A++, so almost every new house has an MVHR unit \u2013 and its filters need replacing regularly. What this filter set protects against The filter set includes 3 filters of different [&hellip;]<\/p>\n","protected":false},"featured_media":30504,"comment_status":"open","ping_status":"closed","template":"","meta":{"_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"","_yoast_wpseo_focuskw":"","_yoast_wpseo_canonical":"","_yoast_wpseo_meta-robots-noindex":"","_yoast_wpseo_meta-robots-nofollow":"","_yoast_wpseo_opengraph-title":"","_yoast_wpseo_opengraph-description":"","_yoast_wpseo_bctitle":"","_yoast_wpseo_primary_category":"","_yoast_wpseo_primary_product_cat":"","rank_math_title":"","rank_math_description":"Original G4+G4+F7 filter set for the Vallox 121 SE\/MC MVHR unit: 3 filters. Manufacturer part no. 3422900. Replace every 3\u20136 months.","rank_math_focus_keyword":"","rank_math_canonical_url":"","rank_math_robots":[],"_how_to_change":"Instructions for changing the filters can be found in your unit's operating manual. If you have any questions, we are happy to help: info@filtrupasaulis.lt","_delivery_info":"<strong>Order Processing Time<\/strong>\r\nAll in-stock products are dispatched within 1\u20132 business days, except for clearly marked items with an extended dispatch time (5\u201310 business days).\r\n\r\n<strong>Shipping Costs<\/strong>\r\nShipping is free for all orders over \u20ac59. For orders up to \u20ac59, shipping costs will be calculated at checkout.\r\n\r\n<strong>Order Tracking<\/strong>\r\nOnce your order has been dispatched, we will send you a confirmation email with tracking details so you can easily follow its journey to you.\r\n\r\n<strong>Business Days<\/strong>\r\nDelivery times are calculated in business days \u2013 from Monday to Friday, excluding public holidays.\r\n\r\n<strong>Easy returns within 30 days<\/strong>\r\nYou may return any product within 30 days of receiving it for a full refund \u2013 no questions asked!\r\n\r\nIf you need to return items after 30 days, please contact us. We review these requests on a case-by-case basis and will do our best to help.\r\n\r\n<strong>Condition of returned products<\/strong>\r\nWe accept returns of products unused in intact condition, including those unpacked but not damaged. Products that are damaged, dirty, or otherwise unusable cannot be accepted for return.\r\n\r\n<strong>Defective or incorrect items<\/strong>\r\nIf you receive a defective or incorrect product, please contact us immediately. We will ensure the issue is resolved promptly, as your satisfaction is our top priority.\r\n\r\n<strong>How to return an item?<\/strong>\r\nPlease contact us before sending back any products. We will provide you with the return shipping details and assist you throughout the process. We cover all costs of return shipping.\r\n\r\n<strong>Refund processing timeline<\/strong>\r\nOnce your returned product is delivered to us, we will verify its condition within 5 working days. Refunds will be processed within an additional 5 working days after approval, using the original payment method.\r\n\r\n<strong>Is it possible to cancel my order?<\/strong>\r\nYes, cancellations are possible before your order has been shipped.","_original_product_code":"3422900","_shipped_within":"1-2 working days","_product_quantity":3,"_enable_bulk_discount":"yes","_bulk_discount_rules":[{"min_quantity":2,"discount_percentage":4},{"min_quantity":3,"discount_percentage":8},{"min_quantity":4,"discount_percentage":12}],"_csh_hreflang":"{\"x-default\":\"https:\\\/\\\/filterloop.eu\\\/product\\\/vallox-121-se-mc-filter-set-no-21-g4g4f7-original\\\/\",\"en\":\"https:\\\/\\\/filterloop.eu\\\/product\\\/vallox-121-se-mc-filter-set-no-21-g4g4f7-original\\\/\",\"en-GB\":\"https:\\\/\\\/filterexpress.co.uk\\\/product\\\/vallox-121-se-mc-filter-set-no-21-g4g4f7-original\\\/\",\"de-DE\":\"https:\\\/\\\/filterimperium.de\\\/produkt\\\/vallox-121-se-mc-filterset-nr-21-g4g4f7-original\\\/\",\"en-DE\":\"https:\\\/\\\/filterimperium.de\\\/en\\\/product\\\/vallox-121-se-mc-filter-set-no-21-g4g4f7-original\\\/\",\"et-EE\":\"https:\\\/\\\/filtriturg.ee\\\/toode\\\/vallox-121-se-mc-filtrikomplekt-nr-21-g4g4f7-originaal\\\/\",\"en-EE\":\"https:\\\/\\\/filtriturg.ee\\\/en\\\/product\\\/vallox-121-se-mc-filter-set-no-21-g4g4f7-original\\\/\",\"ru-EE\":\"https:\\\/\\\/filtriturg.ee\\\/ru\\\/produkt\\\/vallox-121-se-mc-filter-set-no-21-g4g4f7-original\\\/\",\"lv-LV\":\"https:\\\/\\\/filtrupasaule.lv\\\/produkts\\\/vallox-121-se-mc-filtru-komplekts-nr-21-g4g4f7-originals\\\/\",\"en-LV\":\"https:\\\/\\\/filtrupasaule.lv\\\/en\\\/product\\\/vallox-121-se-mc-filter-set-no-21-g4g4f7-original\\\/\",\"ru-LV\":\"https:\\\/\\\/filtrupasaule.lv\\\/ru\\\/produkt\\\/vallox-121-se-mc-filter-set-no-21-g4g4f7-original\\\/\",\"fi-FI\":\"https:\\\/\\\/filtri.fi\\\/tuote\\\/vallox-121-se-mc-suodatinsarja-nro-21-g4g4f7-original\\\/\",\"en-FI\":\"https:\\\/\\\/filtri.fi\\\/en\\\/product\\\/vallox-121-se-mc-filter-set-no-21-g4g4f7-original\\\/\",\"sv-FI\":\"https:\\\/\\\/filtri.fi\\\/sv\\\/produkt\\\/vallox-121-se-mc-filtersats-nr-21-g4g4f7-original\\\/\",\"nl-BE\":\"https:\\\/\\\/filterdirect.be\\\/product\\\/vallox-121-se-mc-filterset-nr-21-g4g4f7-original\\\/\",\"en-BE\":\"https:\\\/\\\/filterdirect.be\\\/en\\\/product\\\/vallox-121-se-mc-filter-set-no-21-g4g4f7-original\\\/\",\"de-BE\":\"https:\\\/\\\/filterdirect.be\\\/de\\\/produkt\\\/vallox-121-se-mc-filterset-nr-21-g4g4f7-original\\\/\",\"fr-BE\":\"https:\\\/\\\/filterdirect.be\\\/fr\\\/produit\\\/jeu-de-filtres-vallox-121-se-mc-n-21-g4g4f7-original\\\/\",\"lt-LT\":\"https:\\\/\\\/filtrupasaulis.lt\\\/produktas\\\/vallox-121-se-mc-filtru-rinkinys-nr-21-g4g4f7-originalus\\\/\",\"en-LT\":\"https:\\\/\\\/filtrupasaulis.lt\\\/en\\\/product\\\/vallox-121-se-mc-filter-set-no-21-g4g4f7-original\\\/\",\"ru-LT\":\"https:\\\/\\\/filtrupasaulis.lt\\\/ru\\\/produkt\\\/vallox-121-se-mc-filter-set-no-21-g4g4f7-original\\\/\",\"de-AT\":\"https:\\\/\\\/filtermarkt.at\\\/produkt\\\/vallox-121-se-mc-filterset-nr-21-g4g4f7-original\\\/\",\"en-AT\":\"https:\\\/\\\/filtermarkt.at\\\/en\\\/product\\\/vallox-121-se-mc-filter-set-no-21-g4g4f7-original\\\/\"}"},"product_brand":[9475],"product_cat":[1419,8944],"product_tag":[],"class_list":["post-27602","product","type-product","status-publish","has-post-thumbnail","product_brand-vallox","product_cat-vallox","product_cat-vallox-121-se-mc","first","instock","taxable","shipping-taxable","purchasable","product-type-simple"],"wp_mcp_seo":{"plugin":"rankmath","title":"","description":"Original G4+G4+F7 filter set for the Vallox 121 SE\/MC MVHR unit: 3 filters. 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