{"id":4523,"date":"2026-09-16T21:04:59","date_gmt":"2026-09-16T13:04:59","guid":{"rendered":"https:\/\/www.kcvents.com\/green-building-ventilation-leed-breeam-passive-house\/"},"modified":"2026-09-16T21:04:59","modified_gmt":"2026-09-16T13:04:59","slug":"green-building-ventilation-leed-breeam-passive-house","status":"publish","type":"post","link":"https:\/\/www.kcvents.com\/es\/green-building-ventilation-leed-breeam-passive-house\/","title":{"rendered":"Green Building Ventilation: What LEED, BREEAM and Passive House Actually Require"},"content":{"rendered":"

Green building schemes do not certify ventilation products. LEED, BREEAM and Passive House all set requirements on the building<\/em> \u2014 its energy demand, its airtightness, its indoor air quality performance \u2014 and those requirements then flow downhill into how the ventilation system must be designed and documented. If you are a distributor or contractor being asked “is your unit certified for LEED?”, the honest answer is that the question is framed wrongly, and understanding why helps you answer it well.<\/p>\n\n\n\n

This article explains what each scheme actually governs, what it demands of the ventilation system, and what evidence a specifier should be given.<\/p>\n\n\n\n

Three schemes, three different objects<\/h2>\n\n\n\n
\n
<\/th>LEED<\/th>BREEAM<\/th>Passive House<\/th><\/tr><\/thead>
What it rates<\/td>A whole building, by credit<\/td>A whole building, by category<\/td>A building’s energy demand and airtightness, against a defined threshold<\/td><\/tr>\n
Voluntary or mandatory<\/td>Voluntary certification<\/td>Voluntary certification<\/td>Voluntary certification<\/td><\/tr>\n
How it treats ventilation<\/td>Sets a minimum indoor air quality performance requirement that references an ASHRAE ventilation standard<\/td>Assesses indoor air quality within its health and wellbeing category<\/td>Requires controlled mechanical ventilation with heat recovery as one of its core principles<\/td><\/tr>\n
Does it approve products?<\/td>No<\/td>No<\/td>No<\/td><\/tr>\n<\/tbody><\/table><\/figure>\n\n\n\n

The consequence is the same in all three cases: the ventilation equipment enters the project as a component that must help the designer reach a building-level target. The evidence that matters is performance data and documentation, not a badge on a fan.<\/p>\n\n\n\n

Passive House: the most directly linked to ventilation<\/h2>\n\n\n\n

Passive House is the scheme with the most explicit ventilation requirement, because its whole approach depends on it. The Passive House Institute sets out the approach as a set of principles, including a very good level of thermal insulation, highly energy-efficient windows, thermal-bridge-free construction, airtightness, and \u2014 the one that concerns ventilation suppliers directly \u2014 controlled mechanical ventilation with heat recovery<\/strong>.<\/p>\n\n\n\n

The reason is structural rather than arbitrary. A Passive House building is deliberately airtight, so it cannot rely on incidental leakage for fresh air the way a conventional building does. Ventilation has to be provided mechanically, and because the building is designed around very low heating demand, throwing away the heat in the exhaust air would undermine the whole concept. Heat recovery is what makes continuous mechanical ventilation compatible with a very low energy demand.<\/p>\n\n\n\n

Passive House also defines numeric thresholds \u2014 for space heating demand and for airtightness measured by a blower-door test \u2014 and cites a high heat-recovery efficiency for the ventilation unit. Those exact figures are set by the Passive House Institute and change over time, so confirm the current requirements and the applicable certification criteria directly with PHI rather than relying on a number quoted in a brochure.<\/p>\n\n\n\n

The practical implication for a supplier: a project seeking Passive House certification needs a unit whose heat recovery efficiency and airflow can be documented<\/em>, at the operating point the design requires. Claims without test data do not help the designer.<\/p>\n\n\n\n

LEED and BREEAM: building-level assessment, ventilation as an input<\/h2>\n\n\n\n

LEED and BREEAM assess a whole building against a set of credits or categories. Both treat indoor air quality as a component of the assessment, and both ultimately point the designer back to a ventilation standard \u2014 in LEED’s case, an ASHRAE ventilation standard forms the basis of its minimum indoor air quality performance requirement, which is why ASHRAE 62.1 is such a frequent reference on commercial projects in North America.<\/p>\n\n\n\n

BREEAM’s scheme versions are released periodically, and the version a project registers under is fixed at registration. Confirm the current version and the specific indoor air quality requirements with BRE or an accredited assessor for the project at hand, since the credit structure and requirements evolve between versions.<\/p>\n\n\n\n

Neither scheme lists or approves ventilation products. A designer working toward LEED or BREEAM needs from a supplier: measured airflow at the design static pressure, sound data at the relevant operating condition, power consumption, and documentation of which test method produced those numbers.<\/p>\n\n\n\n

The efficiency number that gets misused<\/h2>\n\n\n\n

Heat recovery efficiency is the single most quoted and most misquoted figure in green building ventilation discussions. Eurovent Certification notes that heat exchange efficiency on mechanical ventilation with heat recovery systems ranges from around 70% to over 95% \u2014 which means a headline number at the top of that range is achievable in principle, but the range is wide and the system-level result depends on more than the core.<\/p>\n\n\n\n

Three cautions follow. First, efficiency measured at one airflow and one temperature differential is not the efficiency at your design point. Second, the recovery efficiency of a heat exchanger core is not the same as the seasonal performance of the installed unit. Third, published performance should state the test method and the conditions, or it cannot be compared with a competing figure at all. Eurovent’s own framing is useful here: MVHR efficiency is not only about heat recovery, and the headline percentage is a starting point rather than the answer.<\/p>\n\n\n\n

What to send a specifier<\/h2>\n\n\n\n
    \n
  1. Airflow versus static pressure<\/strong> for the model in question, so the designer can locate the operating point rather than read a free-air maximum.<\/li>\n
  2. Heat recovery performance at stated conditions<\/strong>, with the temperature differential and airflow at which it was measured.<\/li>\n
  3. Sound data<\/strong> at the operating condition, with the test method and measurement position identified.<\/li>\n
  4. Power consumption<\/strong> at the tested operating point, expressed in the metric your market’s regulation uses.<\/li>\n
  5. The test standard and edition<\/strong> behind each of the above, since a report against a superseded edition raises a question the designer will be asked at review.<\/li>\n
  6. Documentation status<\/strong> for the target market \u2014 a clear statement of what exists and what does not, so the designer can plan around it.<\/li>\n<\/ol>\n\n\n\n

    Frequently asked questions<\/h2>\n\n\n\n

    Is there such a thing as a LEED-certified fan?<\/strong>
    No. LEED certifies buildings, not products. What a project needs from a ventilation supplier is documented performance data that supports the design’s compliance path.<\/p>\n\n\n\n

    Does a Passive House project require a specific brand or model?<\/strong>
    No. Passive House sets requirements on the building and on the ventilation system’s performance, including controlled mechanical ventilation with heat recovery. It does not specify or approve manufacturers.<\/p>\n\n\n\n

    Which is stricter for ventilation?<\/strong>
    They are not comparable in that way, because they assess different things: LEED and BREEAM score a building across many categories, while Passive House sets a defined energy and airtightness threshold. A project can pursue more than one. The binding requirement for your project is whatever the registered scheme and the local building code specify together.<\/p>\n\n\n\n

    A brochure says 95% heat recovery. Can I use that number?<\/strong>
    Only with the test conditions attached. Recovery efficiency varies with airflow and temperature differential, and a core figure is not a system figure. Ask for the measurement conditions and the test method before repeating any efficiency claim in a project submission.<\/p>\n\n\n\n

    What this means commercially<\/h2>\n\n\n\n

    Green building projects are a documentation sale, not a badge sale. The supplier who can hand a designer a clean performance sheet \u2014 airflow against static pressure, recovery efficiency at stated conditions, sound data with method, power at the operating point \u2014 wins work that a supplier with a vague efficiency claim loses. This is also where the ecodesign and test-standard documentation discussed elsewhere on this site does double duty, because the same test data serves both the regulatory file and the project submission.<\/p>\n\n\n\n

    KCvents manufactures HRV and ERV units, inline duct fans, exhaust fans and fresh air ventilation systems for residential and commercial projects, and supplies distributors and contractors internationally. Tell us the design airflow, static pressure and target market, and we will provide the performance data for the relevant models.<\/p>\n\n\n\n

    Solicitar presupuesto<\/a> or contact our team<\/a>.<\/p>\n\n\n\n

    Sources<\/h2>\n\n\n\n