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A horizontal-airflow biofilter without a pressurized headspace was designed with the hope of eliminating problems that had been observed with the previous pressurized-headspace design. Seven distinct biofilter units were constructed adjacent to a commercial hog barn in southern Manitoba. Airflow characteristics through the biofilter were mapped; more air exited through the top surface of the biofilter than was anticipated. Zeolite added to the biofilter media (wood chip and compost mixture) enhanced the effectiveness of hydrogen sulfide reduction without negatively affecting airflow characteristics. The proposed comparison of three moisture application systems was unable to be completed because the hay probe moisture meter could not be satisfactorily calibrated in the media.