Yes. But you need an appropriate environment.
Your human-sized species might make do with as little as 1000 kCal per day (if they had a fully human metabolism that would be in the neighbourhood of 2000 kCal, but you can posit a slower metabolism).
So we're left with two requirements: nutrients, and energy. Human food supplies both, but here we need some more flexibility.
We can supply energy using suitable vapours.
Gas and alcohol would supply more than enough energy, but that would mean living in a potentially detonating atmosphere. Not recommended. Heavier carbon chains are less reactive, so you could imagine a heavy "fog" of, essentially, heavy Diesel fuel droplets. This could be produced by tree analogues with some equivalent of the Fischer-Tropsch process, and dispersed in the atmosphere, either ubiquitously or in special "feeding ponds". By inhalation, our creatures could easily fulfill their energy requirements; instead of compression, their lungs would simply absorb the fluid and distribute it in the "blood", and the cells would oxidise it much like ours oxidise glucose.
Efficient hygroscopic management and sufficiently humid atmosphere takes care of the drinking needs.
Energy requirements having been taken care of, the quantity of required nutrients will go way down; excepting the growing youngs, pregnant females and those healing from wounds, the adult specimens would need little to no extra mass.
By making growth and healing lengthy processes, we can work around both problems.
Our creatures would inhale somewhat more air than a human would, let's say around 20 cubic meters per day; a possible, if very high, concentration of dust in the air is one full gram per cubic meter (the human COSHH limit is 10 mg/m³ for inhalable dust, but densities up to two orders of magnitude higher have been reported in dust storms and inside containers of specific substances such as flour, maize and sawdust). These densities aren't sustainable for long periods (dust will precipitate and I can't seem to come up with a sensible mechanism to keep it aloft), but the young might romp in the "sawdust", or maybe simply snort it.
Twenty grams of matter per day isn't very much, but that's only for those chemicals that can't be supplied in gaseous form - the "ashes", so to speak. An average adult human being is about 3 kilogram "ashes", and that quantity can be easily inhaled in a couple of years (or as little as five months, if passive inhaling is all that it takes). Our people might be less reliant on heavy and uncommon elements (and be thinner to boot), and only require maybe one to two kilograms of solids.
Having the bones made of carbon compounds (lignin, etc.) would get rid of most of the calcium, which is the large majority in weight of human ashes, and carbon we can absorb from the atmospheric fuel.
Of the main building blocks of organic matter - CHONPS - we can easily supply the first four through respiration and suitable chemical reactions. The relative quantities of Phosphorus and Sulfur are small, and both exist in gaseous form as phosphane, organophosphorous compounds, and hydrogen sulfide.
We only need dust for the remainder.
Of course, at this point the "air" your people breathe is not air anymore, it more closely resembles smoke from a tyre deposit fire mixed with insecticides or nerve gas.