After conducting various site visits and meetings we have been asked to provide a staged option to improve the extraction operation. Our initial review concluded the 3 fans on the main hoods front of house to be undersized when design requires these fans to be capable of double that. We propose to offer the following upgrades to improve the extraction hood performance.
The current hood setup is as follows-
- Main Hood- 2 of Cyclo V38 Fan motors which only offer 1500 l/s at best. That means we are a total of 3000 l/s which is less than half of what’s required for the type of cooking which falls under the following category – open flame charcoal, high smoke.
- Side hood- 1 of Cyclo V38 fan which only offers 1500l/s at best. Again, we are less than half of what is required due to the hood being for -open flame charcoal, high smoke.
The key points for what the Australian Standards state for each hood are below-
- Main hood 5m x 1m 1.3m above countertop – open flame charcoal high smoke, min design duty is 5850 l/s (your fans can only offer up to 3000 l/s at best but our readings showed much less than that)
- Side hood 2.4 x 1m 1.3m above countertop – open flame charcoal high smoke, min amount acceptable/required is 3315 l/s
We propose the following works to improve the current operation.
- Replace the 3 existing Exhaust fans on the hood with 3 new fans that offer up to 4000 liters/sec each
- Each Exhaust fan to be connected to VSD drives (3 of supplied and installed by ENE Services) which will give the option to balance airflow when and if required.
- Supply and installation of 1 new inline make up supply air fan. Required to assist with balancing the system.
- Supply air make up to be connected to VSD drive (1 of supplied and installed by ENE Services) for 1 of the make up air fans
- Extending ductwork on the roof to separate exhaust air from makeup air , required as per Australian Standards
- Supply and installation of flexible ductwork from the new make up air fan ducting to new outlets located around the kitchen exhaust hood
- Utilize one existing exhaust fan assembly removed from front of house to be relocated to back kitchen exhaust hood.
- Blanking of back kitchen hood where extra filters have been cut in
- Make up air from the evap cooler to be relocated to the back kitchen and also balanced to assist with better performance.
- Balancing to include correct positioning of air registers.
- Increase the duct sizing between the hood and the motors on the roof.
Items to note-
- Current air conditioning may be affected due to improved extraction/make up air performance. Additional cooling capacity may be required
- System performance will be monitored and adjusted as required for up to a 7 day period from the date of installation. This period will be called the – test and commissioning period
Exclusions-
- Electrical works by others
- Any items other than mentioned in the above scope
- Patching/painting
- Building/electrical upgrades
Payment Terms-
50% deposit required on acceptance with the remaining balance payable on completion of works.
The above will offer vastly greater performance but this is not an engineered solution. We have offered this solution based of our previous experience with kitchen exhaust systems.
Ideally I would say to look at starting fresh and get a mechanical engineer/consultant in to offer an end to end solution but this would be a much greater cost but with that comes certain guarantees but that is your call to decide
