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This images shows the filtration zone where the ventilation occurs.

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Question - is this helpful?  Will need permission.  This is from the second reference.

This is an example for the required tobacco product categorization, property description, and design parameter information in an FDA marketing application for one type of tobacco product Cigarette. There are many more and various types of tobacco products, and their parameters can be found in the in the FDA final rule and guidance documents for tobacco products Premarket Authorization (PMTA) and Substantial Equivalence (SE) Pathways. The applicant submitting for SE and PMTAs should provide test data to include test protocols, quantitative acceptance criteria, data sets, and summary of results as applicable for these parameters.

Tobacco Products (TO) is a study reference dataset that provides a mechanism for uniquely identifying a tobacco product. It is similar to Device Identifiers (DI) in function. The primary purpose of this dataset is to provide a list of the products used in an application or study and to provide identifying information for each product, such as product category type, manufacturer, model (product) name, etc., as applicable. All identifying information is grouped by the Sponsor Tobacco Product Identifier (SPTOBID) (similar to Sponsor Device Identifier (SPDEVID) a consistent variable, that is available for use in other domains where data pertaining to the product may be found.

Steve H's suggestion of combining our  previous product identifiers and product descriptors into a single dataset. This is a more traditional findings dataset structure. Advantages: it doesn't break any rules. SPTOBID is the Sponsor-defined Tobacco Product Identifier, and serves as the "subject" of all records since these are not (human) subject-level data.example illustrates the representation of a cigarette product's identifiers and descriptors using the TO domain. Note that this example uses TOSCAT (Subcategory of Tobacco Prod ID Element, a permissible variable) to emphasize and differentiate the 2 distinct types of parameters represented in TO: tobacco product identifiers and tobacco product descriptors.