diff --git a/README.md b/README.md index a0ac3f9fcbbc5eec6a9a22885145b26efad14f5b..ce3d1b8dc64d0fd8ccb847df618a6388f0d9aceb 100644 --- a/README.md +++ b/README.md @@ -1,7 +1,11 @@ # COVID-19 Filter Testing ## testing instrument -<img src="./cad_1.png" height="600"> +<img src="./cad_1.png" height="500"> + +This filter efficency testing device is a blend of ASTM standards F2299, F2101, and the henderson apparatus detailed by Wilkes[^filterPerformance]. + +compressed air enters at the center of the device and first passes through a HEPA filter (a).