There are 4 components to the design: the funnel start, filter box, carbon dioxide holder for analysis, and the funnel exit. Remember to put a carbon filter in the filter box so that the air is separated.
First, connect the funnel start to one end of the filter box with hole.
Then, secure the funnel exit to the other end of the filter box with the hole.
Next, connect the carbon dioxide holder to the filter box, which would directly capture the carbon dioxide.
Essentially, the air goes into the funnel start and the filter box filters the air for carbon dioxide and takes the carbon dioxide into the separate tube to the container, and flushes the excess air out through the funnel exit.