Cleaning doors. Good indoor air also means cleanability of ductwork

Transcription

1 Good indoor air also means cleanability of ductwork

2 General An AC plant must be designed, constructed and installed so that its interior, all of its components, including those inside ducts, and the ductwork can be cleaned and maintained through cleaning doors or by removing components. There must be openings in a dropped ceiling. If the large size of a duct requires that the duct must be cleaned from the inside, the type and location of the cleaning door must allow safe and unobstructed access and exit for cleaning staff. The design and installation documentation must specify the location, type and dimensions of cleaning doors as well as the devices uring devices, etc.). The settings for these devices must also be included to allow the correct settings to be restored after cleaning. Any component removable for cleaning can be used as a cleaning door as long as it meets the criteria set for cleaning doors. The cleaning method may vary according to the air distribution system and cleanliness class, which also determine the frequency of cleaning as well as the location of cleaning doors and the distance between them. The tightness of cleaning doors must match that of the same way as the duct. Cleaning doors in public places or otherwise accessible by unauthorised persons must be protected so that they cannot cause injury to people or be easily removed, pushed into the duct, opened without a tool, etc. In the case of an uninsulated cleaning door within in place must be ensured to prevent the spread of combustion gases within and outside the compartment. Size If the cleaning method is known and documented, the size of cleaning doors can be determined according to the cleaning method and be bigger or smaller than what is given in the tables. Minimum dimensions for cleaning door, circular duct Nominal duct size D (mm) Table 1. Rectangular or oval opening Minimum opening in the duct A x B (mm) Nominal duct size Minimum opening or D (mm) branch size d (mm) Table 2. Branch or T-piece with duct end Minimum dimensions for cleaning door, rectangular duct Side of the duct where the Minimum opening opening is made S (mm) in the duct A x B (mm) Side of the duct where the Minimum opening or opening is made S (mm) branch size d (mm) If the technical documentation does not specify a cleaning method, the door size should be as in the tables. The tables conform to pren12097 Rev9. Fläkt Woods FIFLO EN All rights reserved.

3 Location The cleaning of duct-internal components that cannot be cleaned through or removed for cleaning must be made possible by, for example, providing them with cleaning doors on both sides. Such components include: - regulation and shut-down dampers - heating and cooling coils - duct fans - heat recovery devices Cleaning doors must be located to allow cleaning of the duct/component where the shape or size of the duct changes. A change in the duct size or shape may require a change of cleaning tool or method. Rising ducts should be provided with cleaning doors at both ends. Distance The distance between two cleaning doors depends on the ductwork design and the cleaning method. The cleaning doors must be located to allow cleaning of the entire ductwork and all of its components. Cleaning method not documented. Max. distance: 7.5 m (pren12097) - straight duct, no change in diameter - straight duct, diameter changes by one size - max. one bend of more than 45 Safety Screws and/or rivets: Ducts are typically joined together using screws or rivets, provided that there is no risk of damage to cleaning tools or injury to cleaning staff. Rivets are recommended. Screws must not exceed 13 mm in length. Sharp-pointed screws should not be used within 1 m of an air terminal device or cleaning door or on ducts that must be entered by a person for clean- duct, any sharp screws must be replaced with rivets within 1 m of the door. When making an opening in a duct for a retro- or projections around the opening. When installing cleaning doors or cleaning the ductwork, wear suitable gloves and other appropriate personal protective equipment and adhere to Cleaning doors in public places: accessible by unauthorised persons, must be secured in place using, for example, self-tapping screws to make it impossible to open the door without a tool. Spread of smoke through cleaning doors: In the case of an uninsulated cleaning door within a place, even when the sealings, etc. are gone, must be ensured to minimise the spread of combustion gases within the compartment. Installation Install and secure the door in accordance with the instructions supplied with it. Cleaning method: brushing. Max. distance: 10 m - brushing, straight duct, no change in diameter - brushing, straight duct, diameter changes by two sizes - brushing, max. two 90 bends, no change in diameter Max. distance 3 5 m - ducts of exhaust air class 4, depending on impurities contained in the air All rights reserved.

4 Examples of cleaning door placement All rights reserved.

5 Opening Nominal diameter Order example: BDKL BDKL Size Opening A B Weight cm mm mm kg L Cover Kansi Frame Kehys cc B Bs BDBL cc 03 = 30 mm 06 = 60 mm 04 = 40 mm 08 = 80 mm 05 = 50 mm 10 = 100 mm Order example: BDBL Tiiviste Sealing Size Opening Weight (kg) sisä ulko - cc (cm) All rights reserved.

6 piece size Size Opening A B L Weight cm mm mm mm kg BDKP Nominal diameter Order example: BDKP piece size B Li B Li C x E Rm Rm C BDKE cleaning bend for uninsulated ductwork. Installation example: Cooker hood Nominal diameter Order example: BDKE-025 BDKE - Opening Rm= B C E Weight cm mm mm mm mm kg Fläkt Woods FIFLO EN All rights reserved.

7 20 Order example: BDEG BDEG Weight cm kg 20 Order example: BDEG BDEG Weight cm kg All rights reserved.

8 C With handle Order examle: BDEG BDEG K Li C Weight cm mm mm kg Li C BDEG KE Insulated, with handle Order example: BDEG KE Li C Weight cm mm mm kg Li Fläkt Woods FIFLO EN All rights reserved.

9 Order example: BDEG BDEG Weight cm kg E.g. detachable IRIS 20 d L Li With handle Order example: BDEM K BDEM K Li L Weight cm mm mm kg All rights reserved.

10 C D B Opening A BFKL aaa - Nominal size, cm Order example: BFKL Size Opening aaa- A B C D Weight cm mm mm mm mm kg Frame Kehys Cover Kansi D B Bs Inner Sisäaukko opening As As x Bs x Bs Nominal size, cm 04 = 40 mm 05 = 50 mm 06 = 60 mm 08 = 80 mm 10 = 100 mm BFBL - aaa - - cm As A C Sealing Tiiviste Size Opening Weight (kg) ulko sisä cm cc Order example: BFBL Fläkt Woods FIFLO EN All rights reserved.

11 Fläkt Woods FIFLO EN All rights reserved.

12 Fläkt Woods Group Brings Air to Life Head offices Fläkt Woods Oy Finland Fläkt Woods Limited Axial Way CLEANING DIOORS/ENG/FIFLO /All rights reserved. Sales Offices available World Wide - See our website for details Due to a policy of continuous development and improvement the right is reserved to supply products which may differ from those illustrated and described in this publication. Certified dimensions will be supplied on request on receipt of order.