-50% discount* If you buy the same UNE standard in different languages. * Discount on the lower pvp.

CEN/TS 18335:2026

Ventilation for buildings - Ventilative cooling systems - Design

Edition date: 2026-10-21
In Force
Available languages: English
Summary: This document gives guidance to the design of ventilative cooling systems while referring to relevant standards to ensure coherence and avoiding overlapping. In this document different design approaches for use of natural, mechanical or hybrid ventilative cooling can be found, starting at the feasibility phase before going into the design phase. In addition, this document gives guidance on where to find additional information on the design, calculation and maintenance of such systems. This document is applicable to buildings specified according to the thermal indoor environmental aspects used for human occupancy where production processes don’t have a major impact on the indoor environmental quality. This document is applicable to residential and non-residential buildings. This document applies to all types of buildings: new and retrofit, residential and non-residential. This document is applicable to: - mechanical ventilative cooling - natural ventilative cooling - hybrid ventilative cooling - airing as a supplement to ventilative cooling specifically relevant during e.g. power failures - supplementary free cooling as a supplement to ventilative cooling The design of supplementary free cooling systems and active cooling systems are not part of the normative part of the document. However, the interface between ventilative cooling systems and supplementary free cooling systems as well as the interface between ventilative cooling and active cooling systems are mentioned informatively. Design of ventilative cooling systems commonly considers other aspects like energy use, acoustic, draught, solar gain control, outdoor air quality, user acceptance, burglary and cleaning and maintenance, though these are not covered in detail in this document. This document only covers temperature control. This document does not apply to: - moisture control - waterborne - heat losses.

Dieses Dokument bietet eine Anleitung für die Gestaltung von Systemen für ventilative Kühlung unter Bezugnahme auf die relevanten Normen, um die Kohärenz sicherzustellen und Überschneidung zu vermeiden. Dieses Dokument enthält verschiedene Gestaltungsansätze für natürliche, maschinelle oder hybride ventilative Kühlung beginnend mit der Machbarkeitsphase vor dem Übergang in die Gestaltungsphase. Darüber hinaus enthält dieses Dokument eine Anleitung dafür, wo zusätzliche Informationen zur Gestaltung, Berechnung und Instandhaltung solcher Systeme zu finden sind. Dieses Dokument ist anwendbar für Gebäude, die entsprechend den thermischen Innenraum-Umgebungsaspekten für die menschliche Nutzung, wo Produktionsprozesse keinen wesentlichen Einfluss auf die Umgebungsqualität in Innenräumen haben, festgelegt sind. Dieses Dokument ist anwendbar für Wohngebäude und Nichtwohngebäude. Dieses Dokument ist anwendbar für alle Arten von Gebäuden: neu und nachgerüstet, Wohngebäude und Nichtwohngebäude. Dieses Dokument ist anwendbar für:  maschinelle ventilative Kühlung;  natürliche ventilative Kühlung;  hybride ventilative Kühlung;  Fensterlüftung als Ergänzung zur ventilativen Kühlung, besonders relevant z. B. bei Stromausfällen;  ergänzende freie Kühlung zusätzlich zur ventilativen Kühlung. Die Gestaltung von ergänzenden freien Kühlsystemen und aktiven Kühlsystemen ist nicht Gegenstand des normativen Teils dieses Dokuments. Jedoch werden die Schnittstelle zwischen Systemen für ventilative Kühlung und ergänzenden freien Kühlsystemen sowie die Schnittstelle zwischen Systemen für ventilative Kühlung und aktiven Kühlsystemen informativ erwähnt. Bei der Gestaltung von Systemen für ventilative Kühlung werden üblicherweise andere Aspekte wie der Energieverbrauch, Akustik, Zug, Solareintrag, Außenluftqualität, Benutzerakzeptanz, Einbruch und Reinigung in Instandhaltung berücksichtigt, die jedoch in diesem Dokument nicht im Einzelnen behandelt werden. Dieses Dokument behandelt nur die Temperaturregelung. Dieses Dokument ist nicht anwendbar für Folgende:  Feuchtekontrolle;  wassergetragen;  Wärmeverluste werden in diesem Dokument nicht spezifisch behandelt.
ICS: 91.140.30-Ventilation and air-conditioning
CTN: CEN/TC 156 - 6138

The book in the author's words

Ultricies magna feugiat malesuada sociosqu varius vivamus cubilia parturient, himenaeos vitae vehicula nam placerat netus urna platea, nostra rutrum felis mattis penatibus velit quisque.
Frequently Asked Questions Do you have any questions about our products?
  • Standards UNE, EN, ISO, IEC, BSI, DIN, ASTM, AFNOR, IEEE, SAE
  • In addition, you can request the rules of the rest of the organizations through the e-mail normas@aenor.com
  • Technical books on paper and in electronic format (PDF, epub).

The standards can be purchased in PDF, reading or paper. The reading standards are not download files, they can only be viewed in the client area. The standards ordered on paper and some of the books in the catalogue are printed on demand. 

Check deadlines in normas@aenor.com.

The license of use is for one user and one device, if you want to reproduce the content of the standard, you must request a license that will have an additional cost. Send us your inquiry here 

 

The use of standards and other content protected by intellectual property rights in AI systems is prohibited. If you are interested in such uses, please contact normas@aenor.com. Failure to comply will result in the withdrawal of your Access licence.

The AENOR standards and books that appear in the online store can only be purchased exclusively through the website. AENOR does not have a physical store.

Purchase procedure: by clicking on "Buy" the desired products will go to the shopping cart. If there are display problems, the recommended browser is Chrome.

To formalize the purchase you must access the customer area. If you are not registered as a customer, you must fill in a form with the data along with a password and username. This will create the account.

Once the "Customer data" form has been completed, "Order in progress" will be displayed with all the items loaded in the shopping cart, their prices, taxes established in current legislation and shipping costs if applicable.

The prices of the standards and books that appear in the various sections do not include taxes or shipping costs.

AENOR promotional codes consist of alphanumeric characters and can only be applied to online purchases, received through a specific offer and for a limited time. To apply your promotional code, you just have to enter it in step 2 of 4 of the purchase process on the website and click on "apply", after you have identified yourself and chosen the payment methods. Promo codes are not cumulative.

 

  • Credit or debit card (Visa, Mastercard) and PayPal.
  • Bank transfer. If you opt for this form of payment, you must first send AENOR a copy of the transfer by email to normas@aenor.com
  • The purchase invoice can be downloaded from the customer area, in my previous orders

In the case of clients of companies based abroad, the taxpayer identification number of the corresponding country (for example, in Argentina the CUIT), must be filled in the CIF/NIF - VAT field .

  • Direct download via the website in the Customer Area. In the customer area, which can only be accessed with a password and username, the products purchased will be available for a period of fifteen days from the date of purchase, as long as the payment has been accepted. Files in digital format are protected and in no case editable. Before purchasing them, it is important that the license of use is read and accepted as a prior step to purchase.
  • Shipping by courier. Products purchased on physical media are shipped by courier. The maximum delivery time in Spanish territory, from the acceptance of the order by AENOR, is:
  •  Approximately seven working days for all standards purchased through the store in paper format.
  • Approximately three days for books purchased through the store. Stocks of paper books are limited and their offer on the website does not imply availability within the indicated period. In the event that the requested book is not available, the customer is notified of the delay in receiving the order, which will be approximately seven working days. 

For the rest of the products that are not on the website, check availability and delivery time at normas@aenor.com.

1. For digital products (PDF, Epub), once delivery has been made by direct download via the website in the Customer Area, you will not have the right to exercise your right of withdrawal.

2. For personalised products on paper, once the purchase has been made, you will not have the right to exercise your right of withdrawal.

3.  For all other paper products, you have the right to withdraw from the sale within 14 calendar days from the date of purchase. Remember that for the return it is essential that the product is in perfect condition, sealed by the packaging and preserving its original packaging. The customer will be responsible for pickup and shipping costs.

The order invoice includes shipping costs, so there is no amount to pay to the courier. Shipping costs are calculated based on both the final destination of the order and the number of products ordered. They include transport and packaging costs. Shipping costs are subject to periodic revisions. Outlet books will have free shipping costs only if the shipment is made in the Peninsula.

Destination Up to three standards and/or publications From three standards and/or publications
Peninsula 7,31€ 8,60€
Balearic Islands 18,04€ 23,34€
Canary Islands, Ceuta and Melilla  18,04€ 23,34€
Europe 59,17€ 80,07€
United States and Canada 70,07€ 96,94€
Rest of the world 91,94€ 115,91€
  • Purchases made by residents of the Member States of the European Union will be subject to the payment of VAT (value added tax).
  • ​​
  • In the case of legal persons and natural persons who, acting as entrepreneurs, are domiciled in a Member State of the European Union (except residents in Spain) and have an intra-community NIF/VAT registered in the VIES census, they will be exempt from paying VAT, being an essential condition the sending of this document by email to normas@aenor.com.
  • Purchases made in a private capacity (natural person), regardless of where they have their residence, will be subject to the payment of VAT.
  • Purchases made by entities in non-EU countries will be exempt from paying VAT, as long as they send the corresponding tax residence document by email to normas@aenor.com.
  • The sale operations will be understood to have been carried out at AENOR's registered office: Génova 6, 28004, Madrid – Spain. 

The contract for the purchase of products through this Website shall be governed by Spanish law. Any dispute arising out of or in connection with the use of the Website or such contract shall be subject to the exclusive jurisdiction of the Courts and Tribunals of Madrid.

Notwithstanding the foregoing, if you are entering into this contract as a consumer under the terms of Royal Decree 1/2007, nothing in this clause shall affect the rights that may be granted to you as such under applicable law.