Information on ventilation operation modes.
Exhaust-Air Mode: The ventilator fan draws the vapors produced during cooking into the extractor hood, where they pass through the grease filter and out into the open air. The grease filter absorbs the grease contained in the vapors produced during cooking. The kitchen is kept virtually free from grease and odors.
Recirculating-Air Mode: To operate in this mode, it is necessary to install an Activated Carbon Filter (available from authorized dealers or in the Bosch Accessories & Parts Store). The ventilator fan draws the vapors produced during cooking into the extractor hood, where they pass through the grease filter before the clean air is discharged back into the kitchen. The grease filter absorbs the grease while the activated carbon filter absorbs any odorous substances.
Information on filters.
Activated Carbon Filter: Carbon filters are used to neutralize odors when your hood is recirculating air around the kitchen. Carbon filters should be replaced when they are noticeably dirty or discolored (usually every 6 to 12 months, depending on ventilator usage). You cannot clean the non-ducted carbon filters; they must be replaced. They may be purchased from your dealer or in the Bosch Accessories & Parts Store.
Metal Grease Filter: The grease filter should be cleaned every 1-3 months depending on usage. When you remove your filter you may notice it is discolored, this is normal and nothing to worry about. Directions for cleaning the grease filter are listed below:
- Remove the filters according to the instructions in the Use & Care Guide.
- Drain and wipe all excess grease with a dry paper towel.
- Soak the filters in hot water and detergent and gently agitate in the water to loosen food particles. Do not use products containing ammonia, abrasives or oven cleaners. Rinse the filters and let them dry before placing in the ventilator.
- Filters may also be cleaned in a dishwasher (please do not include any other items or cutlery in the wash). Washing the filters in a dishwasher may result in slight discoloration.
- Some formulations of dishwasher detergent can discolor the metal that is used in the filters. This does not affect the performance of the filters.
Routine maintenance for your ventilation.
Wipe away grease stains, change carbon filters (for recirculating units only), and wash grease filters on a timely basis.
View our How-to-Videos on the Bosch YouTube Channel to learn how to clean stainless steel.
Stainless steel conditioning cloths can be purchased in the Bosch Accessories & Parts Store (part number 00311134).
Please also refer to the VENTILATION – CLEANING & CARE SECTION for additional information.
What ventilation size is ideal?
The hood width should be no less than the width of the cooking surface.
Island Hoods should overlap the cooking surface by 3” on each side.
How high should the ventilation hood be placed?
In general, it should be placed 30” above the cooking area. Contact a professional installer for additional information related to your specific situation.
What do CFM, sones and static pressure mean in relation to ventilation?
CFM: The amount of air flow moved by the ventilator is measured by CFM. CFM stands for cubic feet per minute. The higher the CFM, the higher the air flow.
Sones: A sone measures the amount of sound that is perceived by a person. It is not the same thing as a decibel, which measures the intensity of sound. One sone is equivalent to the sound of a quiet refrigerator. The lower the sone, the lower the sound perceived.
Static Pressure: Static pressure measures the air flow resistance as air is moved through ductwork. This air flow resistance reduces the effectiveness of the ventilator fan. A fan must have the ability to overcome the static pressure to effectively move air through the duct.
My ventilation hood is not sufficiently ventilating.
The metal filters may not be clean. Clean the metal filters regularly for optimal results. Drain and wipe all excess grease with a dry paper towel. Soak filters in hot water and mild detergent and gently wipe away food particles. Do not use products containing ammonia, abrasives, chlorine or oven cleaners. Rinse the filters and let them dry before placing in the ventilator. Clean filters every 1-3 months, depending on usage.
For best results, turn the ventilation hood on 10 minutes before you start cooking and turn it off 5 minutes after you have finished.
For exhaust ventilation hoods, open a window while it is turned on for optimal results.
The distance between the ventilation hood and cooktop may be too great for optimal ventilation. In general, ventilation should be placed 30” above the cooking area. Contact a professional installer for additional information related to your specific situation.
The width of the ventilation hood may not sufficiently cover the cooking area. In general, the ventilation hood should extend at least 3” on both sides of the cooking area for optimal performance, at the very least it should be at least as wide as the cooking area.
The ducting length may be excessive. The maximum ducting length is 16.4 feet for a straight run (3.2 to 6.5 feet is lost for every right angle in the ducting).
Information on the length of ductwork.
Proper performance is dependent upon proper ducting. Use a trained and qualified installer. Do not use flexible duct, as it creates turbulence and back-pressure, which can reduce performance. Straight runs and gradual turns are best - use the shortest route with the fewest turns possible.