This Case Study and Q&As are about maintenance requirements for a mechanical ventilation fan or ventilation system installed in apartment buildings, including stopping low frequency fan noise.
Table of Contents:
- QUESTION: Can we serve a by-law breach for offensive, non-compliant noise from an industrial fan?
- QUESTION: Does the mechanical ventilation fan require any sort of regulatory inspections to ensure it is in good working order and complies with clean air etc?
- QUESTION: An air conditioning plant sits on the roof directly above our apartment and causes us concern from a low frequency fan noise. How can we stop the noise?
- ARTICLE: Apartment Block Residents Stressed by Fan Noise [Case Study]
Question: Can we serve a by-law breach for offensive, non-compliant noise from an industrial fan?
Answer: Don’t just rely on the by-law enforcement, but also on other authority enforcement.
You would enforce a breach of a by-law about noise and any other by-law you could include. Remember, when there’s a breach, sometimes you can include one or two by-laws on the notice, and then you can get a penalty per by-law rather than just one.
Also, look at engaging other authorities, such as councils. Find out where compliance isn’t met, and have other authorities step in to give you more weight and power.
Don’t just rely on the by-law enforcement, but also on other authority enforcement.
Leanne Habib
Premium Strata
E: [email protected]
P: 02 9281 6440
This post appears in the July 2023 edition of The NSW Strata Magazine.
Question: Does the mechanical ventilation fan require any sort of regulatory inspections to ensure it is in good working order and complies with clean air etc?
Our building has three levels. There are duct panels that carry the mechanical ventilation system between the different levels and eventually to the outside air on top of the roof.
Does the mechanical ventilation fan require any sort of regulatory inspections to ensure it is in good working order and complies with clean air etc? Our system has been installed for 11 years or more and has never been inspected.
Answer: Yes
Yes:
- There are items like air filters (for supply air) that need regular replacement
- Does the system do what it should in Fire Mode (typically shut down in a fire alarm)
- Bearings and belts on the fans and fan motors, lubrication, tightening, noise, full load current of the motor, contactors, Fuses, etc….
- Fan motor control from the switchboard, does it work as it should, are the terminals tight (loose terminals are a fire hazard as they can arc), is the control of the fan via a time clock, is the time clock correctly set. Does it work?
- Therma graphic scan of the mechanical services switchboard the Fan is served by ( this is also a typical requirement of the insurance company)
- Clean the duct every few years (a dirty duct can be a fire hazard as well as an environmental/health concern)
- There could be some energy management opportunities here, is the fan motor on a variable speed drive? Is it Direct on Line (DOL)
- Are there Fire Dampers in the system, these need to be checked regularly (%20 every year)
- Flexible joints need checking, is the system leaking air
- Secure mounting, the systems vibrate and can work them selves or part there of loose and become a hazard.
- and there’s more….
Nigel Wraight
Forte Asset Services
E: [email protected]
P: 1800 351 078
This post appears in Strata News #471.
Question: An air conditioning plant sits on the roof directly above our apartment and causes us concern from a low frequency fan noise. What can we do about the noisy exhaust fan?
We live in a 7 story Strata, completed about 12 months ago, containing 30 units and a ground floor retail/commercial area. The building is a mixed-use development with two owners corporations i.e one lot has 30 residential lots and the other comprises the retail/commercial.
The retail/commercial owners corporation has an air conditioning and refrigeration plant located on the roof of the residential lots. This plant is directly above our unit. The plant equipment is causing us some concern from a Low Frequency fan noise inside our apartment and we are looking to the Owners Corporation to take action to rectify it.
The Strata Committee has advised us that as our apartment is the only unit in the complex that is affected by the fan noise. Because of this, it is up to us to take our own action against the owner and or the tenant of the retail/commercial lot. To this end we have on numerous occasions raised the matter with the owners of the retail/commercial Lot with no action forthcoming.
At our expense, we have engaged an acoustics engineer to provide evidence of the noise problem and intend to again approach the Strata Committee in an attempt to get some action. What can we do about the noisy exhaust fan?
- Does the Strata Committee/Owners Corporation has any obligation to take action since the issue appears to only affect one unit.
- If it is up to the Strata Committee to take action, who would pay the costs of any action that may be required to enforce rectification of the problem?
- Are we entitled to claim a refund of costs we have incurred to investigate and prove that the issue exists?
- If it is an Owners Corporation responsibility is it possible to get a ruling from an authority in order for the Strata Committee to realise it has an obligation to act?
Answer: You have the option to pursue the nuisance provision.
You have the option to pursue Section 153, the nuisance provision, which an individual can do. You don’t need the Owners Corporation to do this for you.
Section 153 is a wide ranging provision covering a multitude of sins. Eg that an Air Conditioner is only used during certain times, whether on common property or lot property.
Head to Fair Trading (and hopefully get a consent order at mediation) or NCAT, if you can’t reach an agreement. Once you have the order, if the other party breaches, like with any NCAT order, you can pursue enforcement via NCAT. NCAT can issue fines and penalties etc to suit Eg the removal of the air conditioner plant.
This is likely to be far more effective than a breach of bylaw order/penalty but as always it is about proving your case, as you would in any court of law, with independent evidence.
Karina Heinz
Progressive Strata
E: [email protected]
P: 02 9389 9599
This post appears in Strata News #284.
NAT: Apartment Block Residents Stressed by Fan Noise [Case Study]
The Problem:
Recently, Trackie was asked to inspect a multi storey apartment block where the ventilation fans on the roof of the building were creating quite a racket! So much so that the residents of this building had taken drastic measures such as climbing onto the roof to turn the fans off. They were clearly frustrated as this is a big no, no.
As it turns out, the fans at this property were noisy, worn out and were at the end of their service life (15 years old). Coupled with high energy consumption, these fans needed to go.
The Solution:
One solution would be to replace the fans like for like, however, this would reduce the noise but the energy costs would remain quite high.
Instead, there is an energy efficient solution that is whisper quiet and comes in the form of an Electronic Commutated (EC) fan. By replacing these fans with EC fans, energy consumption will be slashed because they use less than half the energy of the traditional fans!
How is this possible you ask? Well, it’s because fan speeds can be reduced by 75% which equates to fans being nice and quiet while at the same time, maintaining accurate air flows.
What’s involved in the rectification process?
Step 1: Air Flow Pre Reads
We needed to enter each apartment to carry out air flow pre reads. This process reveals the current air flow position within each apartment. Some apartments are likely to have minimal air flow while others have high levels of air flow.
Step 2: Analysis of Mechanical Drawings
Mechanical drawings are analysed to identify:
- which fans serve which apartments,
- how many inlets there are and finally,
- the required air flow for each inlet.
These calculations provide figures for total air flow requirements in the building. This coupled with duct length and static pressure provides the information required to design the fans for the specific building. It’s usually the case that fans are slightly oversized so that they can be slowed down for extra efficiency.
Step 3: Balance Air Flows
When the fans have been installed, each apartment will need to be accessed a second time to balance the air flows as per the calculations. Once complete, the residents will enjoy adequate ventilation/air flow, peace and quiet and finally, reduced energy consumption.
In summary, the fan rectification process involves:
- taking air flow pre reads,
- engineering energy efficient EC fans,
- installation of new EC fans and finally,
- balancing the air flows so each apartment receives the air flow, as well as the peace and quiet they deserve.
So next time you see someone climbing onto the roof of an apartment building to turn off the fans, maybe it’s a sign that it’s time to get them checked out!
This post appears in Strata News #252.
Tracey Wyber
W: Trackie Industries
E: [email protected]
Have a question about air flow in apartments or something to add to the article? Leave a comment below.
Read next:
- NSW: Minor Renovations (eg Air Conditioner Installation) & Unreasonable Refusal
- QLD: Q&A We’ve Been Told to Install Cages Around Our Air Conditioning Units on Balconies
- Carpark Ventilation
Visit our Maintenance and Common Property, Apartment Living Sustainability, Strata Noise & Neighbours OR Strata Topics by State pages.
After a free PDF of this article Log into your existing LookUpStrata Account to download the printable file. Not a member? Simple – join for free on our Registration page.
Does the nuisance provision apply to nuisance from fan exhaust equipment that is strata company owned ion the roof which is common property? Would the strata company as a whole be in breach of this provision or the individual members of council for allowing the nuisance to continue once it has been brought to their attention?
Hi Kolio
This Q&A will assist:
Question: An air conditioning plant sits on the roof directly above our apartment and causes us concern from a low frequency fan noise. What can we do about the noisy exhaust fan?
For the past 15 years I have managed the building I have also lived in for the past 20 years. I occasionally get notified by residents of the top level of higher-than-usual fan exhaust fan noise being evident. When I investigate it is actually quite difficult to spot the offending fan as from the roof side these all make quite a lot of noise, even when operating perfectly normally. It’s only when you switch off fans while communicating with someone in the affected unit that you can identify which one it is. As soon as this is done, the fan motor in question is reconditioned by an old-style engineering shop (windings, bearings etc) and refitted, and the problem is eliminated. You DON’T want to install a new fan if possible as these are junk. Our 1982 vintage fan motors are only just starting to fail after 36 years, whereas the new motors made in some backyard operation in Vietnam or China last 7 years at best. Hang onto your old fans and get them reconditioned as they don’t build them like that anymore.
As to the question of complaints from people who don’t like the fan noise, even when the fans are proven to be operating as per spec and in perfect working order, and the way they where were when the building was commissioned, this is like people who move into close proximity of a busy international airport and then object to the aircraft noise and want the airport moved or changes made to the operating times to reduce the noise, or someone who moves in next to a long established amusement park and objects to the shrieks coming from people on the big dipper and want the park closed down.
In both the above cases the noisy facility was already in place, and operating within their approved noise envelope. The same applies to rooftop exhaust fans. Provided they’re working as they were when first installed, and were approved, and properly maintained so they operate as normal, there is no case to embark on costly alterations to satisfy the delicate requirements of a top-floor dweller with noise phobia.
A man (unknowingly) suffering from acousticophobia moved in on the top floor of the building I manage and immediately began complaining of the fan noise. I had the fan replaced, but that wasn’t enough! He when objected to the noise of rushing air at the ceiling vent grill that occurs when you have an exhaust fan operating in a bathroom or laundry. You can change fan motors but not the laws of physics, so despite my best efforts, the man eventually conceded defeat and moved, and his long suffering wife, to somewhere else. I think people like this guy really should consider moving to the country far away from any man-made noises, or cows!
In this particular case, it was an old building that had had many modifications and there were no ‘as built’ or design drawings. So by carrying out the air flow pre-reads we then built the data base regarding which riser was serving which apartment including how many bathrooms, en-suites and laundry’s. Using that data and applying AS 1668.2, we then selected the correct fans fit for purpose and restored the ventilation to comply with standards.
Hi Tracey,
Would you be able to point me to some of the companies that install EC fans on apartment buildings?
Thank you
Just wondering how this is going to provide BCA F4 AS1668.2 conformance pertaining to the necessity of minimum 25L/s for all toilets and laundry exhausts as well as kitchen exhaust.
There is a reason why these systems are balanced to reflect design air quantities.